To implement this, this cl introduces explicit check smi/heapobject
nodes that we use for the value (and also separate from CheckMaps
now). This will allow us to remove duplicate checks later.

The performance of StoreField itself isn't vastly better due to fixed
register requirements though.

Bug: v8:7700
Change-Id: I98caa290c88be64f41154fd232bde98fb46ce497
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3747870
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81576}