Remove unused byte from Map::instance_sizes field.

src/mips/macro-assembler-mips.cc

Index: src/mips/macro-assembler-mips.cc
diff --git a/src/mips/macro-assembler-mips.cc b/src/mips/macro-assembler-mips.cc
index f554b0c1efc84757d5edc7bd2923272dc1522598..36671fd43b699235625960ce3c8c4a5e1e3d35cb 100644
--- a/src/mips/macro-assembler-mips.cc
+++ b/src/mips/macro-assembler-mips.cc
@@ -3514,26 +3514,6 @@ void MacroAssembler::Allocate(Register object_size,
 }
 
 
-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.
-  And(object, object, Operand(~kHeapObjectTagMask));
-#ifdef DEBUG
-  // Check that the object un-allocated is below the current top.
-  li(scratch, Operand(new_space_allocation_top));
-  lw(scratch, MemOperand(scratch));
-  Check(less, kUndoAllocationOfNonAllocatedMemory,
-      object, Operand(scratch));
-#endif
-  // Write the address of the object to un-allocate as the current top.
-  li(scratch, Operand(new_space_allocation_top));
-  sw(object, MemOperand(scratch));
-}
-
-
 void MacroAssembler::AllocateTwoByteString(Register result,
                                            Register length,
                                            Register scratch1,