A64: Synchronize with r15545.

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 14228cc21cb6e3722d7f3d243c2b20a0116a226d..124153b52d653a54d8a2c367031319a748bbde30 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -1252,7 +1252,7 @@ class MacroAssembler: public Assembler {
                                 int return_value_offset_from_rbp);
 
   // Before calling a C-function from generated code, align arguments on stack.
-  // After aligning the frame, arguments must be stored in esp[0], esp[4],
+  // After aligning the frame, arguments must be stored in rsp[0], rsp[8],
   // etc., not pushed. The argument count assumes all arguments are word sized.
   // The number of slots reserved for arguments depends on platform. On Windows
   // stack slots are reserved for the arguments passed in registers. On other