[Interpreter] Localize the CanonicalHandleScope to parsing and renumbering.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index bdddfd35465f9d781c232b5fb5ab38604ccaf17b..8ac50ccf682327191d2970e5aee56d647bb45f4c 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -421,11 +421,6 @@ MUST_USE_RESULT MaybeHandle<Code> GetUnoptimizedCode(CompilationInfo* info) {
   VMState<COMPILER> state(info->isolate());
   PostponeInterruptsScope postpone(info->isolate());
 
-  // Create a canonical handle scope before internalizing parsed values if
-  // compiling bytecode. This is required for off-thread bytecode generation.
-  std::unique_ptr<CanonicalHandleScope> canonical;
-  if (FLAG_ignition) canonical.reset(new CanonicalHandleScope(info->isolate()));
-
   // Parse and update CompilationInfo with the results.
   if (!Parser::ParseStatic(info->parse_info())) return MaybeHandle<Code>();
   DCHECK_EQ(info->shared_info()->language_mode(),
@@ -1027,11 +1022,6 @@ Handle<SharedFunctionInfo> CompileToplevel(CompilationInfo* info) {
   ParseInfo* parse_info = info->parse_info();
   Handle<Script> script = parse_info->script();
 
-  // Create a canonical handle scope before internalizing parsed values if
-  // compiling bytecode. This is required for off-thread bytecode generation.
-  std::unique_ptr<CanonicalHandleScope> canonical;
-  if (FLAG_ignition) canonical.reset(new CanonicalHandleScope(isolate));
-
   // TODO(svenpanne) Obscure place for this, perhaps move to OnBeforeCompile?
   FixedArray* array = isolate->native_context()->embedder_data();
   script->set_context_data(array->get(v8::Context::kDebugIdIndex));
@@ -1774,12 +1764,6 @@ Handle<SharedFunctionInfo> Compiler::GetSharedFunctionInfo(
   RuntimeCallTimerScope runtimeTimer(isolate, &RuntimeCallStats::CompileCode);
   TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), "V8.CompileCode");
 
-  // Create a canonical handle scope if compiling ignition bytecode. This is
-  // required by the constant array builder to de-duplicate common objects
-  // without dereferencing handles.
-  std::unique_ptr<CanonicalHandleScope> canonical;
-  if (FLAG_ignition) canonical.reset(new CanonicalHandleScope(info.isolate()));
-
   if (lazy) {
     info.SetCode(isolate->builtins()->CompileLazy());
   } else if (Renumber(info.parse_info()) && GenerateUnoptimizedCode(&info)) {