Remove unused byte from Map::instance_sizes field.

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index 69b0c5f5a8d1fb53d6eca7a255d07ca415d5f3e8..5ad8410bab0cdfb38c6114552b0d44eb99157b88 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -635,12 +635,6 @@ class MacroAssembler: public Assembler {
                 Label* gc_required,
                 AllocationFlags flags);
 
-  // Undo allocation in new space. The object passed and objects allocated after
-  // it will no longer be allocated. Make sure that no pointers are left to the
-  // object(s) no longer allocated as they would be invalid when allocation is
-  // un-done.
-  void UndoAllocationInNewSpace(Register object);
-
   // Allocate a heap number in new space with undefined value. The
   // register scratch2 can be passed as no_reg; the others must be
   // valid registers. Returns tagged pointer in result register, or