[stubs] Use CSA::IsHeapNumberMap() instead of manual map comparing.

src/builtins/builtins-global.cc

 // Copyright 2016 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/builtins/builtins.h"
 #include "src/builtins/builtins-utils.h"
 
 #include "src/code-factory.h"
 #include "src/compiler.h"
 #include "src/uri.h"
@@ skipping 109 matching lines @@
   {
     // Load the current {num} value.
     Node* num = var_num.value();
 
     // Check if {num} is a Smi or a HeapObject.
     assembler.GotoIf(assembler.TaggedIsSmi(num), &return_true);
 
     // Check if {num} is a HeapNumber.
     Label if_numisheapnumber(&assembler),
         if_numisnotheapnumber(&assembler, Label::kDeferred);
-    assembler.Branch(assembler.WordEqual(assembler.LoadMap(num),
-                                         assembler.HeapNumberMapConstant()),
+    assembler.Branch(assembler.IsHeapNumberMap(assembler.LoadMap(num)),
                      &if_numisheapnumber, &if_numisnotheapnumber);
 
     assembler.Bind(&if_numisheapnumber);
     {
       // Check if {num} contains a finite, non-NaN value.
       Node* num_value = assembler.LoadHeapNumberValue(num);
       assembler.BranchIfFloat64IsNaN(assembler.Float64Sub(num_value, num_value),
                                      &return_false, &return_true);
     }
 
@@ skipping 33 matching lines @@
   {
     // Load the current {num} value.
     Node* num = var_num.value();
 
     // Check if {num} is a Smi or a HeapObject.
     assembler.GotoIf(assembler.TaggedIsSmi(num), &return_false);
 
     // Check if {num} is a HeapNumber.
     Label if_numisheapnumber(&assembler),
         if_numisnotheapnumber(&assembler, Label::kDeferred);
-    assembler.Branch(assembler.WordEqual(assembler.LoadMap(num),
-                                         assembler.HeapNumberMapConstant()),
+    assembler.Branch(assembler.IsHeapNumberMap(assembler.LoadMap(num)),
                      &if_numisheapnumber, &if_numisnotheapnumber);
 
     assembler.Bind(&if_numisheapnumber);
     {
       // Check if {num} contains a NaN.
       Node* num_value = assembler.LoadHeapNumberValue(num);
       assembler.BranchIfFloat64IsNaN(num_value, &return_true, &return_false);
     }
 
     assembler.Bind(&if_numisnotheapnumber);
     {
       // Need to convert {num} to a Number first.
       Callable callable = CodeFactory::NonNumberToNumber(assembler.isolate());
       var_num.Bind(assembler.CallStub(callable, context, num));
       assembler.Goto(&loop);
     }
   }
 
   assembler.Bind(&return_true);
   assembler.Return(assembler.BooleanConstant(true));
 
   assembler.Bind(&return_false);
   assembler.Return(assembler.BooleanConstant(false));
 }
 
 }  // namespace internal
 }  // namespace v8