[Interpreter] Avoid dereferencing handles on BytecodeGenerator for AST operations.

src/compiler-dispatcher/compiler-dispatcher-job.cc

Index: src/compiler-dispatcher/compiler-dispatcher-job.cc
diff --git a/src/compiler-dispatcher/compiler-dispatcher-job.cc b/src/compiler-dispatcher/compiler-dispatcher-job.cc
index a7f83c279dfdb9a3f466b997afcd536de9dec95a..526aba0307993c22dec1673124e81af36328c5b3 100644
--- a/src/compiler-dispatcher/compiler-dispatcher-job.cc
+++ b/src/compiler-dispatcher/compiler-dispatcher-job.cc
@@ -170,6 +170,12 @@ void CompilerDispatcherJob::InternalizeParsingResult() {
          status() == CompileJobStatus::kFailed);
 
   HandleScope scope(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(isolate_));
+
   Handle<SharedFunctionInfo> shared(function_->shared(), isolate_);
   Handle<Script> script(Script::cast(shared->script()), isolate_);