Introduce PopReturnAddressTo and PushReturnAddressFrom macro-assembler instructions for X64

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 13d7ddaa685bf92e16a4adab1faa1dc17fee4aae..0496f14957e2e304c1b49d71bfa44c5370fadf93 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -2798,9 +2798,9 @@ void MacroAssembler::Ret(int bytes_dropped, Register scratch) {
   if (is_uint16(bytes_dropped)) {
     ret(bytes_dropped);
   } else {
-    pop(scratch);
+    PopReturnAddressTo(scratch);
     addq(rsp, Immediate(bytes_dropped));
-    push(scratch);
+    PushReturnAddressFrom(scratch);
     ret(0);
   }
 }
@@ -3567,8 +3567,7 @@ void MacroAssembler::LeaveExitFrame(bool save_doubles) {
   // from the caller stack.
   lea(rsp, Operand(r15, 1 * kPointerSize));
 
-  // Push the return address to get ready to return.
-  push(rcx);
+  PushReturnAddressFrom(rcx);
 
   LeaveExitFrameEpilogue();
 }