[stubs] Add IsCallableMap predicate to CSA

src/builtins/builtins-object.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/property-descriptor.h"
 
@@ skipping 425 matching lines @@
 
     assembler->Bind(&return_jsproxy);
     {
       assembler->GotoIf(assembler->WordEqual(var_proxy_is_array.value(),
                                              assembler->BooleanConstant(true)),
                         &return_array);
 
       Node* map = assembler->LoadMap(receiver);
 
       // Return object if the proxy {receiver} is not callable.
-      assembler->Branch(
-          assembler->Word32Equal(
-              assembler->Word32And(
-                  assembler->LoadMapBitField(map),
-                  assembler->Int32Constant(1 << Map::kIsCallable)),
-              assembler->Int32Constant(0)),
-          &return_object, &return_function);
+      assembler->Branch(assembler->IsCallableMap(map), &return_function,
+                        &return_object);
     }
 
     // Default
     assembler->Bind(&return_object);
     assembler->Return(assembler->HeapConstant(
         assembler->isolate()->factory()->object_to_string()));
   }
 }
 
 void Builtins::Generate_ObjectCreate(CodeStubAssembler* a) {
@@ skipping 583 matching lines @@
   typedef CompareDescriptor Descriptor;
   Node* object = assembler->Parameter(Descriptor::kLeft);
   Node* callable = assembler->Parameter(Descriptor::kRight);
   Node* context = assembler->Parameter(Descriptor::kContext);
 
   assembler->Return(assembler->InstanceOf(object, callable, context));
 }
 
 }  // namespace internal
 }  // namespace v8