Add complete ElementKind information directly to Map for objects with elements.

src/ia32/full-codegen-ia32.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3353 matching lines @@
   Operand array_length_operand = Operand(esp, 0);
   __ sub(Operand(esp), Immediate(2 * kPointerSize));
   __ cld();
   // Check that the array is a JSArray
   __ test(array, Immediate(kSmiTagMask));
   __ j(zero, &bailout);
   __ CmpObjectType(array, JS_ARRAY_TYPE, scratch);
   __ j(not_equal, &bailout);
 
   // Check that the array has fast elements.
-  __ test_b(FieldOperand(scratch, Map::kBitField2Offset),
-            1 << Map::kHasFastElements);
-  __ j(zero, &bailout);
+  __ CheckFastElements(scratch, &bailout);
 
   // If the array has length zero, return the empty string.
   __ mov(array_length, FieldOperand(array, JSArray::kLengthOffset));
   __ SmiUntag(array_length);
   __ j(not_zero, &non_trivial_array);
   __ mov(result_operand, isolate()->factory()->empty_string());
   __ jmp(&done);
 
   // Save the array length.
   __ bind(&non_trivial_array);
@@ skipping 942 matching lines @@
   // And return.
   __ ret(0);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32