Introduce MoveReturnAddress instruction into X64 Macro Assembler

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index 7e00d6408e2a5b5a8fb00a4b070586b03a79ccca..5f1769d7e8ec1e22fe3afaba01c966211d407bee 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -848,6 +848,8 @@ class MacroAssembler: public Assembler {
   void PopReturnAddressTo(Register dst) { pop(dst); }
   void MoveDouble(Register dst, const Operand& src) { movq(dst, src); }
   void MoveDouble(const Operand& dst, Register src) { movq(dst, src); }
+  void MoveReturnAddress(Register dst, const Operand& src) { movq(dst, src); }
+  void MoveReturnAddress(const Operand& dst, Register src) { movq(dst, src); }
   void Move(Register dst, ExternalReference ext) {
     movq(dst, reinterpret_cast<Address>(ext.address()),
          RelocInfo::EXTERNAL_REFERENCE);
@@ -1592,11 +1594,6 @@ inline Operand StackSpaceOperand(int index) {
 }
 
 
-inline Operand StackOperandForReturnAddress(int32_t disp) {
-  return Operand(rsp, disp);
-}
-
-
 #ifdef GENERATED_CODE_COVERAGE
 extern void LogGeneratedCodeCoverage(const char* file_line);
 #define CODE_COVERAGE_STRINGIFY(x) #x