[crankshaft] Get rid of the StoreFrameContext instruction.

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

Index: src/crankshaft/mips/lithium-codegen-mips.cc
diff --git a/src/crankshaft/mips/lithium-codegen-mips.cc b/src/crankshaft/mips/lithium-codegen-mips.cc
index 68973669ee3a53223cfdb9f537a58684240b7448..b16a450afc004d77f45feccfeb91c55a0e464296 100644
--- a/src/crankshaft/mips/lithium-codegen-mips.cc
+++ b/src/crankshaft/mips/lithium-codegen-mips.cc
@@ -5558,13 +5558,6 @@ void LCodeGen::DoLoadFieldByIndex(LLoadFieldByIndex* instr) {
   __ bind(&done);
 }
 
-
-void LCodeGen::DoStoreFrameContext(LStoreFrameContext* instr) {
-  Register context = ToRegister(instr->context());
-  __ sw(context, MemOperand(fp, StandardFrameConstants::kContextOffset));
-}
-
-
 #undef __
 
 }  // namespace internal