Remove unused byte from Map::instance_sizes field.

src/ppc/macro-assembler-ppc.h

 // Copyright 2014 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.
 
 #ifndef V8_PPC_MACRO_ASSEMBLER_PPC_H_
 #define V8_PPC_MACRO_ASSEMBLER_PPC_H_
 
 #include "src/assembler.h"
 #include "src/bailout-reason.h"
 #include "src/frames.h"
@@ skipping 600 matching lines @@
   // label. The allocated object is returned in result. If the flag
   // tag_allocated_object is true the result is tagged as as a heap object.
   // All registers are clobbered also when control continues at the gc_required
   // label.
   void Allocate(int object_size, Register result, Register scratch1,
                 Register scratch2, Label* gc_required, AllocationFlags flags);
 
   void Allocate(Register object_size, Register result, Register scratch1,
                 Register scratch2, Label* gc_required, AllocationFlags flags);
 
-  // Undo allocation in new space. The object passed and objects allocated after
-  // it will no longer be allocated. The caller must make sure that no pointers
-  // are left to the object(s) no longer allocated as they would be invalid when
-  // allocation is undone.
-  void UndoAllocationInNewSpace(Register object, Register scratch);
-
-
   void AllocateTwoByteString(Register result, Register length,
                              Register scratch1, Register scratch2,
                              Register scratch3, Label* gc_required);
   void AllocateOneByteString(Register result, Register length,
                              Register scratch1, Register scratch2,
                              Register scratch3, Label* gc_required);
   void AllocateTwoByteConsString(Register result, Register length,
                                  Register scratch1, Register scratch2,
                                  Label* gc_required);
   void AllocateOneByteConsString(Register result, Register length,
@@ skipping 935 matching lines @@
 #define ACCESS_MASM(masm)    \
   masm->stop(__FILE_LINE__); \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 }
 }  // namespace v8::internal
 
 #endif  // V8_PPC_MACRO_ASSEMBLER_PPC_H_