Updates and fixes for MIPS support.

src/mips/frames-mips.cc

 // Copyright 2010 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 51 matching lines @@
   }
   // Fill in the state.
   state->sp = sp;
   state->fp = fp;
   state->pc_address = reinterpret_cast<Address*>(sp - 1 * kPointerSize);
   return EXIT;
 }
 
 
 void ExitFrame::Iterate(ObjectVisitor* v) const {
-  // Do nothing
+  UNIMPLEMENTED_MIPS();
 }
 
 
 int JavaScriptFrame::GetProvidedParametersCount() const {
   return ComputeParametersCount();
 }
 
 
 Address JavaScriptFrame::GetCallerStackPointer() const {
   UNIMPLEMENTED_MIPS();
   return static_cast<Address>(NULL);  // UNIMPLEMENTED RETURN
 }
 
 
 Address ArgumentsAdaptorFrame::GetCallerStackPointer() const {
   UNIMPLEMENTED_MIPS();
   return static_cast<Address>(NULL);  // UNIMPLEMENTED RETURN
 }
 
 
 Address InternalFrame::GetCallerStackPointer() const {
   return fp() + StandardFrameConstants::kCallerSPOffset;
 }
 
 
 } }  // namespace v8::internal