Handlify DeoptimizedFrameInfo, remove custom GC iteration.

src/debug/debug-scopes.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/debug/debug-scopes.h"
 
 #include "src/ast/scopes.h"
 #include "src/debug/debug.h"
 #include "src/frames-inl.h"
 #include "src/globals.h"
@@ skipping 10 matching lines @@
       nested_scope_chain_(4),
       non_locals_(nullptr),
       seen_script_scope_(false),
       failed_(false) {
   if (!frame_inspector->GetContext()->IsContext() ||
       !frame_inspector->GetFunction()->IsJSFunction()) {
     // Optimized frame, context or function cannot be materialized. Give up.
     return;
   }
 
-  context_ = Handle<Context>(Context::cast(frame_inspector->GetContext()));
+  context_ = Handle<Context>::cast(frame_inspector->GetContext());
 
   // Catch the case when the debugger stops in an internal function.
   Handle<JSFunction> function = GetFunction();
   Handle<SharedFunctionInfo> shared_info(function->shared());
   Handle<ScopeInfo> scope_info(shared_info->scope_info());
   if (shared_info->script() == isolate->heap()->undefined_value()) {
     while (context_->closure() == *function) {
       context_ = Handle<Context>(context_->previous(), isolate_);
     }
     return;
@@ skipping 409 matching lines @@
 }
 
 
 MaybeHandle<JSObject> ScopeIterator::MaterializeLocalScope() {
   Handle<JSFunction> function = GetFunction();
 
   Handle<JSObject> local_scope =
       isolate_->factory()->NewJSObject(isolate_->object_function());
   frame_inspector_->MaterializeStackLocals(local_scope, function);
 
-  Handle<Context> frame_context(Context::cast(frame_inspector_->GetContext()));
+  Handle<Context> frame_context =
+      Handle<Context>::cast(frame_inspector_->GetContext());
 
   HandleScope scope(isolate_);
   Handle<SharedFunctionInfo> shared(function->shared());
   Handle<ScopeInfo> scope_info(shared->scope_info());
 
   if (!scope_info->HasContext()) return local_scope;
 
   // Third fill all context locals.
   Handle<Context> function_context(frame_context->closure_context());
   CopyContextLocalsToScopeObject(scope_info, function_context, local_scope);
@@ skipping 337 matching lines @@
         isolate_, value, Object::GetPropertyOrElement(extension, key), false);
     RETURN_ON_EXCEPTION_VALUE(
         isolate_, JSObject::SetOwnPropertyIgnoreAttributes(
             scope_object, key, value, NONE), false);
   }
   return true;
 }
 
 }  // namespace internal
 }  // namespace v8