Drive-by: Make the code less verbose my returning the input node from
SetInt32Type.

Bug: v8:7748, chromium:1332385
Change-Id: I2fde9c2168af1365e305e7e8d894b03487e8a8d9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3687692Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80970}