Remove unused byte from Map::instance_sizes field.

src/ia32/macro-assembler-ia32.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 "src/v8.h"
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 1476 matching lines @@
   if ((flags & TAG_OBJECT) != 0) {
     DCHECK(kHeapObjectTag == 1);
     inc(result);
   }
 
   // Update allocation top.
   UpdateAllocationTopHelper(result_end, scratch, flags);
 }
 
 
-void MacroAssembler::UndoAllocationInNewSpace(Register object) {
-  ExternalReference new_space_allocation_top =
-      ExternalReference::new_space_allocation_top_address(isolate());
-
-  // Make sure the object has no tag before resetting top.
-  and_(object, Immediate(~kHeapObjectTagMask));
-#ifdef DEBUG
-  cmp(object, Operand::StaticVariable(new_space_allocation_top));
-  Check(below, kUndoAllocationOfNonAllocatedMemory);
-#endif
-  mov(Operand::StaticVariable(new_space_allocation_top), object);
-}
-
-
 void MacroAssembler::AllocateHeapNumber(Register result,
                                         Register scratch1,
                                         Register scratch2,
                                         Label* gc_required,
                                         MutableMode mode) {
   // Allocate heap number in new space.
   Allocate(HeapNumber::kSize, result, scratch1, scratch2, gc_required,
            TAG_OBJECT);
 
   Handle<Map> map = mode == MUTABLE
@@ skipping 1703 matching lines @@
   mov(eax, dividend);
   shr(eax, 31);
   add(edx, eax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32