[vm] Don't create UnboxedConstantInstr(kUnboxedInt64) for RISCV32.

TEST=dartfuzz
Bug: https://github.com/dart-lang/sdk/issues/54425
Bug: https://github.com/dart-lang/sdk/issues/54434
Change-Id: I05975376cd61ffeceda60edf76df182fbf753593
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/345348
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>

runtime/vm/compiler/aot/aot_call_specializer.cc

@@ -402,7 +402,7 @@ Definition* AotCallSpecializer::TryOptimizeDivisionOperation(
     Value* right_value) {
   auto unboxed_constant = [&](int64_t value) -> Definition* {
     ASSERT(compiler::target::IsSmi(value));
-#if defined(TARGET_ARCH_ARM)
+#if defined(TARGET_ARCH_IS_32_BIT)
     Definition* const const_def = new (Z) UnboxedConstantInstr(
         Smi::ZoneHandle(Z, Smi::New(value)), kUnboxedInt32);
     InsertBefore(instr, const_def, /*env=*/nullptr, FlowGraph::kValue);

runtime/vm/compiler/backend/il_riscv.cc

@@ -44,6 +44,8 @@ LocationSummary* Instruction::MakeCallSummary(Zone* zone,
   const auto representation = instr->representation();
   switch (representation) {
     case kTagged:
+    case kUnboxedUint32:
+    case kUnboxedInt32:
       result->set_out(
           0, Location::RegisterLocation(CallingConventions::kReturnReg));
       break;

utils/dartdev/BUILD.gn

@@ -25,13 +25,11 @@ application_snapshot("generate_dartdev_snapshot") {
 
   deps = [
     "../dds:dds",
-    "../dtd:dtd"
+    "../dtd:dtd",
   ]
 
   # DDS should be run from AOT snapshot on all architectures except IA32/X86.
-  # TODO(https://dartbug.com/54434): Fix simriscv32 AOT.
-  if (dart_target_arch != "ia32" && dart_target_arch != "x86" &&
-      dart_target_arch != "riscv32") {
+  if (dart_target_arch != "ia32" && dart_target_arch != "x86") {
     deps += [ "../dds:dds_aot" ]
   }