Remove unused byte from Map::instance_sizes field.

src/x87/macro-assembler-x87.h

Index: src/x87/macro-assembler-x87.h
diff --git a/src/x87/macro-assembler-x87.h b/src/x87/macro-assembler-x87.h
index cbaabc89d0927af822905859b31b0771d81fb2ab..24f6f308c0f5408a2cc9ca25951b8ccb9b4a92ea 100644
--- a/src/x87/macro-assembler-x87.h
+++ b/src/x87/macro-assembler-x87.h
@@ -600,12 +600,6 @@ 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