[maglev] Expand bitfield to 64-bit

We need this to expand the max input count to be big enough for our
biggest calls (and to add more bits to the op properties).

Bug: v8:7700
Change-Id: I6d63cf39b3079c3c85a32f208ce925ae795ef5a7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3734811
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81461}