[turbofan] Add AllocateHeapNumberStub to avoid runtime call.

test/unittests/compiler/change-lowering-unittest.cc

 // Copyright 2014 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 "src/compiler/change-lowering.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties-inl.h"
 #include "src/compiler/simplified-operator.h"
 #include "test/unittests/compiler/compiler-test-utils.h"
@@ skipping 61 matching lines @@
     CompilationInfo info(isolate(), zone());
     Linkage linkage(zone(), &info);
     ChangeLowering reducer(&jsgraph, &linkage);
     return reducer.Reduce(node);
   }
 
   SimplifiedOperatorBuilder* simplified() { return &simplified_; }
 
   Matcher<Node*> IsAllocateHeapNumber(const Matcher<Node*>& effect_matcher,
                                       const Matcher<Node*>& control_matcher) {
-    return IsCall(
-        _, IsHeapConstant(Unique<HeapObject>::CreateImmovable(
-               CEntryStub(isolate(), 1).GetCode())),
-        IsExternalConstant(ExternalReference(
-            Runtime::FunctionForId(Runtime::kAllocateHeapNumber), isolate())),
-        IsInt32Constant(0), IsNumberConstant(0.0), effect_matcher,
-        control_matcher);
+    return IsCall(_, IsHeapConstant(Unique<HeapObject>::CreateImmovable(
+                         AllocateHeapNumberStub(isolate()).GetCode())),
+                  IsNumberConstant(0.0), effect_matcher, control_matcher);
   }
   Matcher<Node*> IsLoadHeapNumber(const Matcher<Node*>& value_matcher,
                                   const Matcher<Node*>& control_matcher) {
     return IsLoad(kMachFloat64, value_matcher,
                   IsIntPtrConstant(HeapNumberValueOffset()), graph()->start(),
                   control_matcher);
   }
   Matcher<Node*> IsIntPtrConstant(int value) {
     return Is32() ? IsInt32Constant(value) : IsInt64Constant(value);
   }
@@ skipping 358 matching lines @@
               IsIfTrue(AllOf(CaptureEq(&branch),
                              IsBranch(IsUint32LessThanOrEqual(
                                           val, IsInt32Constant(SmiMaxValue())),
                                       graph()->start()))),
               AllOf(CaptureEq(&if_false), IsIfFalse(CaptureEq(&branch))))));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8