Revert of [refactoring] Split CodeAssemblerState out of CodeAssembler

src/builtins/builtins-iterator.cc

 // Copyright 2016 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/builtins/builtins-utils.h"
 #include "src/builtins/builtins.h"
 #include "src/frames-inl.h"
 
 namespace v8 {
 namespace internal {
 
 void Builtins::Generate_IteratorPrototypeIterator(
-    compiler::CodeAssemblerState* state) {
-  CodeStubAssembler assembler(state);
-  assembler.Return(assembler.Parameter(0));
+    CodeStubAssembler* assembler) {
+  assembler->Return(assembler->Parameter(0));
 }
 
 BUILTIN(ModuleNamespaceIterator) {
   HandleScope scope(isolate);
   DCHECK_EQ(1, args.length());
   Handle<Object> receiver = args.at<Object>(0);
 
   if (!receiver->IsJSModuleNamespace()) {
     THROW_NEW_ERROR_RETURN_FAILURE(
         isolate, NewTypeError(MessageTemplate::kIncompatibleMethodReceiver,
@@ skipping 34 matching lines @@
   } else {
     value = isolate->factory()->undefined_value();
     done = true;
   }
 
   return *isolate->factory()->NewJSIteratorResult(value, done);
 }
 
 }  // namespace internal
 }  // namespace v8