This is a reland of 9c91b687 after
fixing undefined behavior in numeric conversion that caused trouble
on arm32.

Original change's description:
> [turbofan] Use feedback when reducing global loads/stores.
>
> We already record the script context location or the property cell
> as feedback of the global load/store IC, so Turbofan doesn't need
> to do the lookups again.
>
> Change-Id: I6cbd2937de344729cd8e146b4ff85ddf3de6a56e
> Reviewed-on: https://chromium-review.googlesource.com/c/1335691
> Commit-Queue: Georg Neis <neis@chromium.org>
> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#57555}

Change-Id: Ic2d09025de02f92199755ac860bb9e91fa08f4ec
Reviewed-on: https://chromium-review.googlesource.com/c/1340043Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57649}