[turbofan] Add AllocateHeapNumberStub to avoid runtime call.

src/code-stubs.cc

 // 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.
 
 #include "src/code-stubs.h"
 
 #include <sstream>
 
 #include "src/bootstrapper.h"
 #include "src/cpu-profiler.h"
@@ skipping 679 matching lines @@
 }
 
 
 void TransitionElementsKindStub::InitializeDescriptor(
     CodeStubDescriptor* descriptor) {
   descriptor->Initialize(
       Runtime::FunctionForId(Runtime::kTransitionElementsKind)->entry);
 }
 
 
+void AllocateHeapNumberStub::InitializeDescriptor(
+    CodeStubDescriptor* descriptor) {
+  descriptor->Initialize(
+      Runtime::FunctionForId(Runtime::kAllocateHeapNumber)->entry);
+}
+
+
 void CompareNilICStub::InitializeDescriptor(CodeStubDescriptor* descriptor) {
   descriptor->Initialize(FUNCTION_ADDR(CompareNilIC_Miss));
   descriptor->SetMissHandler(
       ExternalReference(IC_Utility(IC::kCompareNilIC_Miss), isolate()));
 }
 
 
 void ToBooleanStub::InitializeDescriptor(CodeStubDescriptor* descriptor) {
   descriptor->Initialize(FUNCTION_ADDR(ToBooleanIC_Miss));
   descriptor->SetMissHandler(
@@ skipping 252 matching lines @@
 }
 
 
 InternalArrayConstructorStub::InternalArrayConstructorStub(
     Isolate* isolate) : PlatformCodeStub(isolate) {
   InternalArrayConstructorStubBase::GenerateStubsAheadOfTime(isolate);
 }
 
 
 } }  // namespace v8::internal