Move the current code sequence in TurboFan to a macro-assembler helper
function to allow Liftoff to reuse it.

Bug: v8:10997
Change-Id: I08a9d5b6d1f7898bf7e9239f54d69867e00b30eb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2620906
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72057}