factor out "ReloadContextFromFrame"

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index 6c1c19df3e86996ea65d508156660692cd28c381..69c8e3fa1306ae7df3e7f529371c998dd1fe5f1b 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -4180,6 +4180,11 @@ void MacroAssembler::InitializeFieldsWithFiller(Register start_offset,
 }
 
 
+void MacroAssembler::ReloadContextFromFrame() {
+  movq(rsi, Operand(rbp, 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.