InitialValue needs to have a spill slot (e.g. for deopts) but shouldn't
emit an actual spill (since they're already on stack).

Drive-by, fix printing of Checkpoint and CheckMaps parameters.

Bug: v8:7700
Change-Id: I3c1acfce6638b1ad604f7c7a1938694814c326ee
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3497371
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79320}