Introduce a code stub version of Array.prototype.push

src/x64/code-stubs-x64.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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 58 matching lines @@
     CodeStubDescriptor* descriptor) {
   InitializeArrayConstructorDescriptor(isolate(), descriptor, -1);
 }
 
 
 void InternalArrayNoArgumentConstructorStub::InitializeDescriptor(
     CodeStubDescriptor* descriptor) {
   InitializeInternalArrayConstructorDescriptor(isolate(), descriptor, 0);
 }
 
+void FastArrayPushStub::InitializeDescriptor(CodeStubDescriptor* descriptor) {
+  Address deopt_handler = Runtime::FunctionForId(Runtime::kArrayPush)->entry;
+  descriptor->Initialize(rax, deopt_handler, -1, JS_FUNCTION_STUB_MODE);
+}
 
 void InternalArraySingleArgumentConstructorStub::InitializeDescriptor(
     CodeStubDescriptor* descriptor) {
   InitializeInternalArrayConstructorDescriptor(isolate(), descriptor, 1);
 }
 
 
 void InternalArrayNArgumentsConstructorStub::InitializeDescriptor(
     CodeStubDescriptor* descriptor) {
   InitializeInternalArrayConstructorDescriptor(isolate(), descriptor, -1);
@@ skipping 5489 matching lines @@
                            NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64