Remove unused byte from Map::instance_sizes field.

src/ppc/macro-assembler-ppc.cc

Index: src/ppc/macro-assembler-ppc.cc
diff --git a/src/ppc/macro-assembler-ppc.cc b/src/ppc/macro-assembler-ppc.cc
index 7cd895583ab9667a8abb48926bcc531b3be70055..65efea7442879ea3fdeeb502e2e8410865112ae9 100644
--- a/src/ppc/macro-assembler-ppc.cc
+++ b/src/ppc/macro-assembler-ppc.cc
@@ -1583,26 +1583,6 @@ void MacroAssembler::Allocate(Register object_size, Register result,
 }
 
 
-void MacroAssembler::UndoAllocationInNewSpace(Register object,
-                                              Register scratch) {
-  ExternalReference new_space_allocation_top =
-      ExternalReference::new_space_allocation_top_address(isolate());
-
-  // Make sure the object has no tag before resetting top.
-  ClearRightImm(object, object, Operand(kHeapObjectTagSize));
-#ifdef DEBUG
-  // Check that the object un-allocated is below the current top.
-  mov(scratch, Operand(new_space_allocation_top));
-  LoadP(scratch, MemOperand(scratch));
-  cmp(object, scratch);
-  Check(lt, kUndoAllocationOfNonAllocatedMemory);
-#endif
-  // Write the address of the object to un-allocate as the current top.
-  mov(scratch, Operand(new_space_allocation_top));
-  StoreP(object, MemOperand(scratch));
-}
-
-
 void MacroAssembler::AllocateTwoByteString(Register result, Register length,
                                            Register scratch1, Register scratch2,
                                            Register scratch3,