[crankshaft] Get rid of the StoreFrameContext instruction.

src/crankshaft/arm64/lithium-codegen-arm64.cc

Index: src/crankshaft/arm64/lithium-codegen-arm64.cc
diff --git a/src/crankshaft/arm64/lithium-codegen-arm64.cc b/src/crankshaft/arm64/lithium-codegen-arm64.cc
index 29eb43224e6cd5c5e7b5bda19a8fa966c4345813..eefa9e08336ea8392f88103a9177fae55f22f5fc 100644
--- a/src/crankshaft/arm64/lithium-codegen-arm64.cc
+++ b/src/crankshaft/arm64/lithium-codegen-arm64.cc
@@ -5730,12 +5730,5 @@ void LCodeGen::DoLoadFieldByIndex(LLoadFieldByIndex* instr) {
   __ Bind(&done);
 }
 
-
-void LCodeGen::DoStoreFrameContext(LStoreFrameContext* instr) {
-  Register context = ToRegister(instr->context());
-  __ Str(context, MemOperand(fp, StandardFrameConstants::kContextOffset));
-}
-
-
 }  // namespace internal
 }  // namespace v8