Create a macro-assembler helper function to enable code sharing between
Liftoff and TurboFan.

Bug: v8:10971
Change-Id: I8d8132f4cf3386b28cdf5350fde2e076428d68c6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2621860
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72067}