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

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index a2780f9d27ec225c753fba1afe6865bdc8e7be17..09b17a7abaabfa927a398bd591fcd3d7813a3ef7 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -2172,6 +2172,11 @@ MaybeLocal<Script> ScriptCompiler::Compile(Local<Context> context,
   source->info->set_script(script);
   source->info->set_context(isolate->native_context());
 
+  // Create a canonical handle scope before internalizing parsed values if
+  // compiling bytecode. This is required for off-thread bytecode generation.
+  std::unique_ptr<i::CanonicalHandleScope> canonical;
+  if (i::FLAG_ignition) canonical.reset(new i::CanonicalHandleScope(isolate));
+
   // Do the parsing tasks which need to be done on the main thread. This will
   // also handle parse errors.
   source->parser->Internalize(isolate, script,