Add a generic DefineNamedOwn node for DefineNamedOwnProperty, and a
monomorphic fast path identical to SetNamedProperty for simple field
stores.

Bug: v8:7700
Change-Id: I35ff9d54be8bb8e437865e4d1ba38eb726034e24
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3663084
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@{#80736}