[crankshaft] Get rid of the StoreFrameContext instruction.

src/crankshaft/mips64/lithium-codegen-mips64.cc

Index: src/crankshaft/mips64/lithium-codegen-mips64.cc
diff --git a/src/crankshaft/mips64/lithium-codegen-mips64.cc b/src/crankshaft/mips64/lithium-codegen-mips64.cc
index ea3a062e3561d9eff67c4edde31d456ebe2e3714..f67eafc9ff6ab4ca5e3bdb35c3fb2d15dbf6b9b2 100644
--- a/src/crankshaft/mips64/lithium-codegen-mips64.cc
+++ b/src/crankshaft/mips64/lithium-codegen-mips64.cc
@@ -5760,13 +5760,6 @@ void LCodeGen::DoLoadFieldByIndex(LLoadFieldByIndex* instr) {
   __ bind(&done);
 }
 
-
-void LCodeGen::DoStoreFrameContext(LStoreFrameContext* instr) {
-  Register context = ToRegister(instr->context());
-  __ sd(context, MemOperand(fp, StandardFrameConstants::kContextOffset));
-}
-
-
 #undef __
 
 }  // namespace internal