This can happen in concurrent compilation, we should fall back to
generic LoadGlobal when it's the case.

Drive-by refactor the property cell load builder to return false on
failure.

Bug: v8:7700
Change-Id: Iad3fc4bc794e4ec8c4061f2dce1561c15593e215
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3706616Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81183}