Convert ElementsKind into a BitField

src/mips/macro-assembler-mips.cc

 // Copyright 2012 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 <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #include "v8.h"
 
 #if V8_TARGET_ARCH_MIPS
 
@@ skipping 5609 matching lines @@
   Register current = scratch0;
   Label loop_again;
 
   // Scratch contained elements pointer.
   Move(current, object);
 
   // Loop based on the map going up the prototype chain.
   bind(&loop_again);
   lw(current, FieldMemOperand(current, HeapObject::kMapOffset));
   lb(scratch1, FieldMemOperand(current, Map::kBitField2Offset));
-  Ext(scratch1, scratch1, Map::kElementsKindShift, Map::kElementsKindBitCount);
+  DecodeField<Map::ElementsKindBits>(scratch1);
   Branch(found, eq, scratch1, Operand(DICTIONARY_ELEMENTS));
   lw(current, FieldMemOperand(current, Map::kPrototypeOffset));
   Branch(&loop_again, ne, current, Operand(factory->null_value()));
 }
 
 
 bool AreAliased(Register r1, Register r2, Register r3, Register r4) {
   if (r1.is(r2)) return true;
   if (r1.is(r3)) return true;
   if (r1.is(r4)) return true;
@@ skipping 80 matching lines @@
   }
   if (ms.shift() > 0) sra(result, result, ms.shift());
   srl(at, dividend, 31);
   Addu(result, result, Operand(at));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS