New hydrogen instruction to reduce cost of growing an array on keyed stores.

src/runtime/runtime.h

 // Copyright 2012 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.
 
 #ifndef V8_RUNTIME_RUNTIME_H_
 #define V8_RUNTIME_RUNTIME_H_
 
 #include "src/allocation.h"
 #include "src/objects.h"
 #include "src/zone.h"
@@ skipping 25 matching lines @@
   F(PushIfAbsent, 2, 1)                                               \
   F(ArrayConcat, 1, 1)                                                \
   F(RemoveArrayHoles, 2, 1)                                           \
   F(MoveArrayContents, 2, 1)                                          \
   F(EstimateNumberOfElements, 1, 1)                                   \
   F(GetArrayKeys, 2, 1)                                               \
   F(ArrayConstructor, -1, 1)                                          \
   F(ArrayConstructorWithSubclassing, -1, 1)                           \
   F(InternalArrayConstructor, -1, 1)                                  \
   F(NormalizeElements, 1, 1)                                          \
-  F(GrowArrayElements, 3, 1)                                          \
+  F(GrowArrayElements, 2, 1)                                          \
   F(HasComplexElements, 1, 1)                                         \
   F(ForInCacheArrayLength, 2, 1) /* TODO(turbofan): Only temporary */ \
   F(IsArray, 1, 1)                                                    \
   F(HasCachedArrayIndex, 1, 1)                                        \
   F(GetCachedArrayIndex, 1, 1)                                        \
   F(FixedArrayGet, 2, 1)                                              \
   F(FixedArraySet, 3, 1)                                              \
   F(FastOneByteArrayJoin, 2, 1)
 
 
@@ skipping 810 matching lines @@
 
 class DeclareGlobalsEvalFlag : public BitField<bool, 0, 1> {};
 class DeclareGlobalsNativeFlag : public BitField<bool, 1, 1> {};
 STATIC_ASSERT(LANGUAGE_END == 3);
 class DeclareGlobalsLanguageMode : public BitField<LanguageMode, 2, 2> {};
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_RUNTIME_RUNTIME_H_