Clean up some uses of Failures and MaybeObjects.

src/ia32/macro-assembler-ia32.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 994 matching lines @@
 
   // Allocation support helpers.
   void LoadAllocationTopHelper(Register result,
                                Register scratch,
                                AllocationFlags flags);
 
   void UpdateAllocationTopHelper(Register result_end,
                                  Register scratch,
                                  AllocationFlags flags);
 
-  // Helper for PopHandleScope.  Allowed to perform a GC and returns
-  // NULL if gc_allowed.  Does not perform a GC if !gc_allowed, and
-  // possibly returns a failure object indicating an allocation failure.
-  MUST_USE_RESULT MaybeObject* PopHandleScopeHelper(Register saved,
-                                                    Register scratch,
-                                                    bool gc_allowed);
-
   // Helper for implementing JumpIfNotInNewSpace and JumpIfInNewSpace.
   void InNewSpace(Register object,
                   Register scratch,
                   Condition cc,
                   Label* condition_met,
                   Label::Distance condition_met_distance = Label::kFar);
 
   // Helper for finding the mark bits for an address.  Afterwards, the
   // bitmap register points at the word with the mark bits and the mask
   // the position of the first bit.  Uses ecx as scratch and leaves addr_reg
@@ skipping 94 matching lines @@
   }                                                                       \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_MACRO_ASSEMBLER_IA32_H_