[vm] Weaken dwarf_stack_trace expected stack trace.

We only check the expected stack starting from the call to
foo in main, so we no longer depend on what is captured in
the stacktrace for how main is invoked.

Also removes the old status lines for this test, which are no
longer applicable, and cleans up the documentation a little.

Fixes https://github.com/dart-lang/sdk/issues/39766.

Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-release-x64-try,vm-kernel-precomp-linux-product-x64-try,vm-kernel-precomp-obfuscate-linux-release-x64-try
Change-Id: I61f0465dcd55d090c49db9c6af503ae9c0df6313
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/128401
Reviewed-by: Clement Skau <cskau@google.com>
Commit-Queue: Teagan Strickland <sstrickl@google.com>

runtime/docs/dwarf_stack_traces.md

@@ -1,7 +1,5 @@
 # Using and interpreting DWARF stack traces
 
-When using the `--dwarf-stack-traces` flag,
-
 The Dart VM AOT compiler can encode code source mapping information as DWARF
 debugging information instead of using in-snapshot `CodeSourceMap` objects.
 Unlike `CodeSourceMap` objects, this DWARF information can then be stripped

tests/standalone_2/dwarf_stack_trace_obfuscate_test.dart

@@ -68,12 +68,6 @@ final expectedCallsInfo = <List<CallInfo>>[
         line: 29,
         inlined: false)
   ],
-  // Internal frames have non-positive line numbers in the call information.
-  [
-    CallInfo(
-        function: "main",
-        filename: "dwarf_stack_trace_obfuscate_test.dart",
-        line: 0,
-        inlined: false),
-  ]
+  // Don't assume anything about any of the frames below the call to foo
+  // in main, as this makes the test too brittle.
 ];

tests/standalone_2/dwarf_stack_trace_test.dart

@@ -160,14 +160,8 @@ final expectedCallsInfo = <List<CallInfo>>[
         line: 30,
         inlined: false)
   ],
-  // Internal frames have non-positive line numbers in the call information.
-  [
-    CallInfo(
-        function: "main",
-        filename: "dwarf_stack_trace_test.dart",
-        line: 0,
-        inlined: false),
-  ]
+  // Don't assume anything about any of the frames below the call to foo
+  // in main, as this makes the test too brittle.
 ];
 
 List<List<CallInfo>> removeInternalCalls(List<List<CallInfo>> original) =>

tests/standalone_2/standalone_2.status

@@ -66,9 +66,6 @@ io/*: Skip # Issue 30618
 [ $compiler != none && $runtime != dart_precompiled && $runtime != vm ]
 env_test: Skip # This is testing a vm command line parsing scenario.
 
-[ $mode == product && $runtime == dart_precompiled ]
-dwarf_stack_trace_test: SkipByDesign # Due to instruction canonicalization we can end up having the wrong names in stack traces.
-
 [ $runtime == vm && $system == linux ]
 io/http_basic_test: Slow # Issue 28046, These tests might be slow on an opt counter threshold bot. They also time out on the bot occasionally => flaky test issue 28046
 io/http_launch_test: Slow # Issue 28046, These tests might be slow on an opt counter threshold bot. They also time out on the bot occasionally => flaky test issue 28046

tests/standalone_2/standalone_2_precompiled.status

@@ -2,9 +2,6 @@
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
-[ $builder_tag == obfuscated ]
-dwarf_stack_trace_test: Pass, RuntimeError # Issue 35563
-
 [ $runtime == dart_precompiled ]
 http_launch_test: Skip
 io/addlatexhash_test: Skip
@@ -58,9 +55,6 @@ package/scenarios/packages_option_only/packages_option_only_test: Skip
 io/socket_cancel_connect_test: RuntimeError # Issue 34142
 io/stdout_stderr_non_blocking_test: Pass, Timeout # Issue 28426
 
-[ $mode == product && $runtime == dart_precompiled ]
-dwarf_stack_trace_test: Pass, RuntimeError # Results will flake due to identical code folding
-
 [ $runtime == dart_precompiled && $checked ]
 io/namespace_test: RuntimeError