factor out "ReloadContextFromFrame"

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index 8a531747097deb4f68f7e05736b42659fbe1b96c..7897ce0df0e365eb292cee14d979141c4471b949 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -2932,6 +2932,11 @@ void MacroAssembler::Abort(const char* msg) {
 }
 
 
+void MacroAssembler::ReloadContextFromFrame() {
+  ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
+}
+
+
 void MacroAssembler::LoadContext(Register dst, int context_chain_length) {
   if (context_chain_length > 0) {
     // Move up the chain of contexts to the context containing the slot.