Remove unused byte from Map::instance_sizes field.

src/ppc/macro-assembler-ppc.h

Index: src/ppc/macro-assembler-ppc.h
diff --git a/src/ppc/macro-assembler-ppc.h b/src/ppc/macro-assembler-ppc.h
index c0992c9171b4602a39e607fc843b48cc62152f4e..04c44315fdea7423ee5a131b80211a9fbc2a4055 100644
--- a/src/ppc/macro-assembler-ppc.h
+++ b/src/ppc/macro-assembler-ppc.h
@@ -618,13 +618,6 @@ class MacroAssembler : public Assembler {
   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);