[for-in] Further refactorings and unification around for-in.

src/crankshaft/hydrogen.cc

 // Copyright 2013 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/crankshaft/hydrogen.h"
 
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast/ast-numbering.h"
@@ skipping 5322 matching lines @@
 
     HForInCacheArray* index_cache = Add<HForInCacheArray>(
         enumerable, map, DescriptorArray::kEnumCacheBridgeIndicesCacheIndex);
     array->set_index_cache(index_cache);
 
     Push(map);
     Push(array);
     Push(enum_length);
     Add<HSimulate>(stmt->PrepareId());
   } else {
-    Runtime::FunctionId function_id = Runtime::kGetPropertyNamesFast;
+    Runtime::FunctionId function_id = Runtime::kForInEnumerate;
     Add<HPushArguments>(enumerable);
     HCallRuntime* array =
         Add<HCallRuntime>(Runtime::FunctionForId(function_id), 1);
     Push(array);
     Add<HSimulate>(stmt->EnumId());
     Drop(1);
 
     IfBuilder if_fast(this);
     if_fast.If<HCompareMap>(array, meta_map);
     if_fast.Then();
@@ skipping 8278 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8