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

src/interpreter/interpreter-assembler.cc

 // Copyright 2015 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/interpreter/interpreter-assembler.h"
 
 #include <limits>
 #include <ostream>
 
 #include "src/code-factory.h"
@@ skipping 1094 matching lines @@
                    Int32Constant(BinaryOperationFeedback::kSignedSmall)));
       Goto(&done_loop);
     }
 
     Bind(&if_valueisnotsmi);
     {
       // Check if {value} is a HeapNumber.
       Label if_valueisheapnumber(this),
           if_valueisnotheapnumber(this, Label::kDeferred);
       Node* value_map = LoadMap(value);
-      Branch(WordEqual(value_map, HeapNumberMapConstant()),
-             &if_valueisheapnumber, &if_valueisnotheapnumber);
+      Branch(IsHeapNumberMap(value_map), &if_valueisheapnumber,
+             &if_valueisnotheapnumber);
 
       Bind(&if_valueisheapnumber);
       {
         // Truncate the floating point value.
         var_result.Bind(TruncateHeapNumberValueToWord32(value));
         var_type_feedback->Bind(
             Word32Or(var_type_feedback->value(),
                      Int32Constant(BinaryOperationFeedback::kNumber)));
         Goto(&done_loop);
       }
@@ skipping 203 matching lines @@
     Goto(&loop);
   }
   Bind(&done_loop);
 
   return array;
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8