[code-stubs] Add LoadMapElementsKind helper

src/builtins/builtins-array.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/elements.h"
 
@@ skipping 1363 matching lines @@
       FAST_HOLEY_ELEMENTS, FAST_DOUBLE_ELEMENTS,    FAST_HOLEY_DOUBLE_ELEMENTS,
   };
 
   Label if_smiorobjects(assembler), if_packed_doubles(assembler),
       if_holey_doubles(assembler);
   Label* element_kind_handlers[] = {&if_smiorobjects,   &if_smiorobjects,
                                     &if_smiorobjects,   &if_smiorobjects,
                                     &if_packed_doubles, &if_holey_doubles};
 
   Node* map = assembler->LoadMap(array);
-  Node* bit_field2 = assembler->LoadMapBitField2(map);
-  Node* elements_kind =
-      assembler->BitFieldDecode<Map::ElementsKindBits>(bit_field2);
+  Node* elements_kind = assembler->LoadMapElementsKind(map);
   Node* elements = assembler->LoadElements(array);
   assembler->Switch(elements_kind, &return_false, kElementsKind,
                     element_kind_handlers, arraysize(kElementsKind));
 
   assembler->Bind(&if_smiorobjects);
   {
     Variable search_num(assembler, MachineRepresentation::kFloat64);
     Label ident_loop(assembler, &index_var),
         heap_num_loop(assembler, &search_num),
         string_loop(assembler, &index_var), simd_loop(assembler),
@@ skipping 424 matching lines @@
       FAST_HOLEY_ELEMENTS, FAST_DOUBLE_ELEMENTS,    FAST_HOLEY_DOUBLE_ELEMENTS,
   };
 
   Label if_smiorobjects(assembler), if_packed_doubles(assembler),
       if_holey_doubles(assembler);
   Label* element_kind_handlers[] = {&if_smiorobjects,   &if_smiorobjects,
                                     &if_smiorobjects,   &if_smiorobjects,
                                     &if_packed_doubles, &if_holey_doubles};
 
   Node* map = assembler->LoadMap(array);
-  Node* bit_field2 = assembler->LoadMapBitField2(map);
-  Node* elements_kind =
-      assembler->BitFieldDecode<Map::ElementsKindBits>(bit_field2);
+  Node* elements_kind = assembler->LoadMapElementsKind(map);
   Node* elements = assembler->LoadElements(array);
   assembler->Switch(elements_kind, &return_not_found, kElementsKind,
                     element_kind_handlers, arraysize(kElementsKind));
 
   assembler->Bind(&if_smiorobjects);
   {
     Variable search_num(assembler, MachineRepresentation::kFloat64);
     Label ident_loop(assembler, &index_var),
         heap_num_loop(assembler, &search_num),
         string_loop(assembler, &index_var), simd_loop(assembler),
@@ skipping 224 matching lines @@
   assembler->Bind(&return_not_found);
   assembler->Return(assembler->NumberConstant(-1));
 
   assembler->Bind(&call_runtime);
   assembler->Return(assembler->CallRuntime(Runtime::kArrayIndexOf, context,
                                            array, search_element, start_from));
 }
 
 }  // namespace internal
 }  // namespace v8