[crankshaft] Get rid of the StoreFrameContext instruction.

src/crankshaft/mips/lithium-codegen-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.7
 // 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 5540 matching lines @@
   __ bind(&out_of_object);
   __ lw(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
   // Index is equal to negated out of object property index plus 1.
   __ Subu(scratch, result, scratch);
   __ lw(result, FieldMemOperand(scratch,
                                 FixedArray::kHeaderSize - kPointerSize));
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
-
-void LCodeGen::DoStoreFrameContext(LStoreFrameContext* instr) {
-  Register context = ToRegister(instr->context());
-  __ sw(context, MemOperand(fp, StandardFrameConstants::kContextOffset));
-}
-
-
 #undef __
 
 }  // namespace internal
 }  // namespace v8