Resolve the TODO to avoid the push/pop of the cycle break temporary
value, by keeping track of whether the scratch register currently holds
the temporary value and spill it if the register is needed for stack
slot moves instead.

Bug: v8:7700
Change-Id: If4119e63312bdc2b89987f92328ae646a46543ee
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3810185
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82203}