Remove unused byte from Map::instance_sizes field.

src/x87/macro-assembler-x87.cc

Index: src/x87/macro-assembler-x87.cc
diff --git a/src/x87/macro-assembler-x87.cc b/src/x87/macro-assembler-x87.cc
index 46c1830c05ba49f374b6f98419be7711044c48c1..5555e5f92047643d47b29e37eba0ffa5e10c75d0 100644
--- a/src/x87/macro-assembler-x87.cc
+++ b/src/x87/macro-assembler-x87.cc
@@ -1460,20 +1460,6 @@ void MacroAssembler::Allocate(Register object_size,
 }
 
 
-void MacroAssembler::UndoAllocationInNewSpace(Register object) {
-  ExternalReference new_space_allocation_top =
-      ExternalReference::new_space_allocation_top_address(isolate());
-
-  // Make sure the object has no tag before resetting top.
-  and_(object, Immediate(~kHeapObjectTagMask));
-#ifdef DEBUG
-  cmp(object, Operand::StaticVariable(new_space_allocation_top));
-  Check(below, kUndoAllocationOfNonAllocatedMemory);
-#endif
-  mov(Operand::StaticVariable(new_space_allocation_top), object);
-}
-
-
 void MacroAssembler::AllocateHeapNumber(Register result,
                                         Register scratch1,
                                         Register scratch2,