The DeepForEachInput helper was not incrementing the input_location
index in the IsResultRegister case, while other paths (graph printing,
code gen) were. Change these to consistently only increment the index
when the input is used (i.e. match DeepForEachInput).

Bug: v8:7700
Change-Id: Iaa54ef4e44db54023e3c19a088d14ad204bb2620
Fixed: chromium:1360800
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3905722
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Jakob Linke <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83355}