Fix arm build.

src/arm/lithium-codegen-arm.cc

 // Copyright 2011 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 261 matching lines @@
     }
 
     // Reserve some space to ensure that the last piece of deferred code
     // have room for lazy bailout.
     __ nop();
     __ nop();
 
     int code_generated =
         masm_->InstructionsGeneratedSince(&last_jump) * Assembler::kInstrSize;
     ASSERT(Deoptimizer::patch_size() <= code_generated);
+    USE(code_generated);
   }
 
   // Force constant pool emission at the end of the deferred code to make
   // sure that no constant pools are emitted after.
   masm()->CheckConstPool(true, false);
 
   return !is_aborted();
 }
 
 
@@ skipping 4108 matching lines @@
   ASSERT(osr_pc_offset_ == -1);
   osr_pc_offset_ = masm()->pc_offset();
 }
 
 
 
 
 #undef __
 
 } }  // namespace v8::internal