[crankshaft] Get rid of the StoreFrameContext instruction.

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

Index: src/crankshaft/ppc/lithium-codegen-ppc.cc
diff --git a/src/crankshaft/ppc/lithium-codegen-ppc.cc b/src/crankshaft/ppc/lithium-codegen-ppc.cc
index 79100ebd3c85d57aa1dc771c24091c441646e2e4..edc0d696b02d2b8de142f8e05a53ef947ed3a7a8 100644
--- a/src/crankshaft/ppc/lithium-codegen-ppc.cc
+++ b/src/crankshaft/ppc/lithium-codegen-ppc.cc
@@ -5753,13 +5753,7 @@ void LCodeGen::DoLoadFieldByIndex(LLoadFieldByIndex* instr) {
   __ bind(&done);
 }
 
-
-void LCodeGen::DoStoreFrameContext(LStoreFrameContext* instr) {
-  Register context = ToRegister(instr->context());
-  __ StoreP(context, MemOperand(fp, StandardFrameConstants::kContextOffset));
-}
-
-
 #undef __
+
 }  // namespace internal
 }  // namespace v8