Build fix. Remove unused variable.

src/arm/virtual-frame-arm.cc

 // Copyright 2009 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 617 matching lines @@
     }
   }
   EnsureOneFreeTOSRegister();
   top_of_stack_state_ = kStateAfterPush[top_of_stack_state_];
   Register dest = kTopRegister[top_of_stack_state_];
   __ Move(dest, reg);
 }
 
 
 void VirtualFrame::SetElementAt(Register reg, int this_far_down) {
-  int virtual_elements = kVirtualElements[top_of_stack_state_];
   if (this_far_down == 0) {
     Pop();
     Register dest = GetTOSRegister();
     if (dest.is(reg)) {
       // We already popped one item off the top of the stack.  If the only
       // free register is the one we were asked to push then we have been
       // asked to push a register that was already in use, which cannot
       // happen.  It therefore folows that there are two free TOS registers:
       ASSERT(top_of_stack_state_ == NO_TOS_REGISTERS);
       dest = dest.is(r0) ? r1 : r0;
@@ skipping 94 matching lines @@
     default:
       UNREACHABLE();
       break;
   }
   ASSERT(register_allocation_map_ == 0);  // Not yet implemented.
 }
 
 #undef __
 
 } }  // namespace v8::internal