[dart2js] Clean up some file paths.

* The wrapped abstract value domain is moved out of the powersets folder
  since they're unrelated.
* {inferrer,ssa}/builder_kernel.dart renamed to just builder.dart since
  we only operate on kernel.
* inferrer/inferrer_engine.dart renamed to engine.dart since it was
  redundant.

Change-Id: I355e626431d8a49e9a944341360b2d6401895929
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/243645
Commit-Queue: Mayank Patke <fishythefish@google.com>
Reviewed-by: Stephen Adams <sra@google.com>

pkg/compiler/lib/src/compiler.dart

@@ -34,11 +34,11 @@ import 'enqueue.dart' show Enqueuer;
 import 'environment.dart';
 import 'inferrer/abstract_value_domain.dart' show AbstractValueStrategy;
 import 'inferrer/trivial.dart' show TrivialAbstractValueStrategy;
-import 'inferrer/powersets/wrapped.dart' show WrappedAbstractValueStrategy;
 import 'inferrer/powersets/powersets.dart' show PowersetStrategy;
 import 'inferrer/typemasks/masks.dart' show TypeMaskStrategy;
 import 'inferrer/types.dart'
     show GlobalTypeInferenceResults, GlobalTypeInferenceTask;
+import 'inferrer/wrapped.dart' show WrappedAbstractValueStrategy;
 import 'ir/modular.dart';
 import 'js_backend/backend.dart' show CodegenInputs;
 import 'js_backend/enqueuer.dart';

pkg/compiler/lib/src/inferrer/builder.dart

@@ -28,7 +28,7 @@ import '../options.dart';
 import '../universe/selector.dart';
 import '../universe/side_effects.dart';
 import '../util/util.dart';
-import 'inferrer_engine.dart';
+import 'engine.dart';
 import 'locals_handler.dart';
 import 'type_graph_nodes.dart';
 import 'type_system.dart';

pkg/compiler/lib/src/inferrer/closure_tracer.dart

@@ -10,7 +10,7 @@ import '../common/names.dart' show Identifiers, Names;
 import '../elements/entities.dart';
 import '../universe/selector.dart' show Selector;
 import 'debug.dart' as debug;
-import 'inferrer_engine.dart';
+import 'engine.dart';
 import 'node_tracer.dart';
 import 'type_graph_nodes.dart';
 

pkg/compiler/lib/src/inferrer/engine.dart

@@ -30,7 +30,7 @@ import '../universe/selector.dart';
 import '../universe/side_effects.dart';
 import '../world.dart';
 import 'abstract_value_domain.dart';
-import 'builder_kernel.dart';
+import 'builder.dart';
 import 'closure_tracer.dart';
 import 'debug.dart' as debug;
 import 'locals_handler.dart';

pkg/compiler/lib/src/inferrer/locals_handler.dart

@@ -11,7 +11,7 @@ import 'package:kernel/ast.dart' as ir;
 import '../elements/entities.dart';
 import '../ir/util.dart';
 import '../util/util.dart';
-import 'inferrer_engine.dart';
+import 'engine.dart';
 import 'type_graph_nodes.dart';
 
 /// A variable scope holds types for variables. It has a link to a

pkg/compiler/lib/src/inferrer/node_tracer.dart

@@ -11,7 +11,7 @@ import '../elements/entities.dart';
 import '../util/util.dart' show Setlet;
 import 'abstract_value_domain.dart';
 import 'debug.dart' as debug;
-import 'inferrer_engine.dart';
+import 'engine.dart';
 import 'type_graph_nodes.dart';
 
 // A set of selectors we know do not escape the elements inside the

pkg/compiler/lib/src/inferrer/type_graph_dump.dart

@@ -10,7 +10,7 @@ import '../../compiler_api.dart' as api;
 import '../elements/entities.dart';
 import '../elements/entity_utils.dart' as utils;
 import 'abstract_value_domain.dart';
-import 'inferrer_engine.dart';
+import 'engine.dart';
 import 'type_graph_nodes.dart';
 import 'debug.dart';
 

pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart

@@ -18,7 +18,7 @@ import '../js_model/elements.dart' show JClosureCallMethod;
 import '../js_model/locals.dart';
 import '../world.dart';
 import 'abstract_value_domain.dart';
-import 'inferrer_engine.dart';
+import 'engine.dart';
 import 'type_graph_nodes.dart';
 import 'types.dart';
 

pkg/compiler/lib/src/inferrer/type_graph_nodes.dart

@@ -20,7 +20,7 @@ import '../world.dart' show JClosedWorld;
 import 'abstract_value_domain.dart';
 import 'debug.dart' as debug;
 import 'locals_handler.dart' show ArgumentsTypes;
-import 'inferrer_engine.dart';
+import 'engine.dart';
 import 'type_system.dart';
 
 /// Common class for all nodes in the graph. The current nodes are:

pkg/compiler/lib/src/inferrer/types.dart

@@ -13,16 +13,16 @@ import '../common/names.dart';
 import '../common/tasks.dart' show CompilerTask;
 import '../compiler.dart' show Compiler;
 import '../elements/entities.dart';
+import '../inferrer/engine.dart';
+import '../inferrer/type_graph_inferrer.dart' show TypeGraphInferrer;
 import '../js_backend/inferred_data.dart';
 import '../js_model/element_map.dart';
 import '../js_model/js_world.dart';
 import '../js_model/locals.dart';
-import '../inferrer/type_graph_inferrer.dart' show TypeGraphInferrer;
 import '../serialization/serialization.dart';
 import '../universe/selector.dart' show Selector;
 import '../world.dart' show JClosedWorld;
 import 'abstract_value_domain.dart';
-import '../inferrer/inferrer_engine.dart';
 
 /// Results about a single element (e.g. a method, parameter, or field)
 /// produced by the global type-inference algorithm.

pkg/compiler/lib/src/inferrer/wrapped.dart

@@ -4,17 +4,17 @@
 
 // @dart = 2.10
 
-import '../../constants/values.dart' show ConstantValue, PrimitiveConstantValue;
-import '../../elements/entities.dart';
-import '../../elements/names.dart';
-import '../../elements/types.dart' show DartType;
-import '../../ir/static_type.dart';
-import '../../serialization/serialization.dart';
-import '../../universe/selector.dart';
-import '../../universe/world_builder.dart';
-import '../../universe/use.dart';
-import '../../world.dart';
-import '../abstract_value_domain.dart';
+import '../constants/values.dart' show ConstantValue, PrimitiveConstantValue;
+import '../elements/entities.dart';
+import '../elements/names.dart';
+import '../elements/types.dart' show DartType;
+import '../ir/static_type.dart';
+import '../serialization/serialization.dart';
+import '../universe/selector.dart';
+import '../universe/world_builder.dart';
+import '../universe/use.dart';
+import '../world.dart';
+import 'abstract_value_domain.dart';
 
 class WrappedAbstractValue implements AbstractValue {
   final AbstractValue _abstractValue;

pkg/compiler/lib/src/js_model/js_strategy.dart

@@ -48,7 +48,7 @@ import '../native/behavior.dart';
 import '../native/enqueue.dart';
 import '../options.dart';
 import '../serialization/serialization.dart';
-import '../ssa/builder_kernel.dart';
+import '../ssa/builder.dart';
 import '../ssa/nodes.dart';
 import '../ssa/ssa.dart';
 import '../ssa/types.dart';

pkg/compiler/lib/src/ssa/branch_builder.dart

@@ -8,7 +8,7 @@ import '../common.dart';
 import '../inferrer/abstract_value_domain.dart';
 import '../io/source_information.dart';
 
-import 'builder_kernel.dart';
+import 'builder.dart';
 import 'locals_handler.dart';
 import 'nodes.dart';
 

pkg/compiler/lib/src/ssa/builder.dart

@@ -53,12 +53,12 @@ import '../universe/selector.dart';
 import '../universe/target_checks.dart' show TargetChecks;
 import '../universe/use.dart' show ConstantUse, StaticUse, TypeUse;
 import '../world.dart';
+import 'branch_builder.dart';
 import 'jump_handler.dart';
-import 'kernel_string_builder.dart';
 import 'locals_handler.dart';
 import 'loop_handler.dart';
 import 'nodes.dart';
-import 'ssa_branch_builder.dart';
+import 'string_builder.dart';
 import 'switch_continue_analysis.dart';
 import 'type_builder.dart';
 

pkg/compiler/lib/src/ssa/jump_handler.dart

@@ -9,7 +9,7 @@ import '../elements/jumps.dart';
 import '../inferrer/abstract_value_domain.dart';
 import '../io/source_information.dart';
 
-import 'builder_kernel.dart';
+import 'builder.dart';
 import 'locals_handler.dart';
 import 'nodes.dart';
 

pkg/compiler/lib/src/ssa/locals_handler.dart

@@ -19,7 +19,7 @@ import '../js_model/closure.dart' show JRecordField, JClosureField;
 import '../js_model/locals.dart' show GlobalLocalsMap, JLocal;
 import '../world.dart' show JClosedWorld;
 
-import 'builder_kernel.dart';
+import 'builder.dart';
 import 'nodes.dart';
 import 'types.dart';
 

pkg/compiler/lib/src/ssa/loop_handler.dart

@@ -11,7 +11,7 @@ import '../elements/jumps.dart';
 import '../inferrer/abstract_value_domain.dart';
 import '../io/source_information.dart';
 
-import 'builder_kernel.dart';
+import 'builder.dart';
 import 'jump_handler.dart';
 import 'locals_handler.dart';
 import 'nodes.dart';

pkg/compiler/lib/src/ssa/string_builder.dart

@@ -8,7 +8,7 @@ import 'package:kernel/ast.dart' as ir;
 
 import '../common.dart';
 import '../inferrer/abstract_value_domain.dart';
-import 'builder_kernel.dart';
+import 'builder.dart';
 import 'nodes.dart';
 
 /// Visits and concatenates the expressions in a string concatenation.

pkg/compiler/lib/src/ssa/type_builder.dart

@@ -4,7 +4,7 @@
 
 // @dart = 2.10
 
-import 'builder_kernel.dart';
+import 'builder.dart';
 import 'nodes.dart';
 import '../elements/entities.dart';
 import '../elements/types.dart';

pkg/compiler/lib/src/tracer.dart

@@ -11,7 +11,7 @@ import 'package:kernel/text/indentation.dart' show Indentation;
 import '../compiler_api.dart' as api;
 import 'options.dart' show CompilerOptions;
 import 'ssa/nodes.dart' as ssa show HGraph;
-import 'ssa/ssa_tracer.dart' show HTracer;
+import 'ssa/tracer.dart' show HTracer;
 import 'world.dart' show JClosedWorld;
 
 String TRACE_FILTER_PATTERN_FOR_TEST;

pkg/compiler/test/inlining/inlining_test.dart

@@ -13,7 +13,7 @@ import 'package:compiler/src/elements/entities.dart';
 import 'package:compiler/src/js_model/element_map.dart';
 import 'package:compiler/src/js_model/js_strategy.dart';
 import 'package:compiler/src/js_model/js_world.dart';
-import 'package:compiler/src/ssa/builder_kernel.dart';
+import 'package:compiler/src/ssa/builder.dart';
 import 'package:compiler/src/universe/world_impact.dart';
 import 'package:compiler/src/universe/use.dart';
 import 'package:kernel/ast.dart' as ir;