When comparing a decoded i33 value (v) to an expected value (ex) given
as a 7-bit unsigned byte, we first truncated (v) to 7 bits. This
resulted in values which coincide with (ex) only in the last 7 digits to
erroneously be accepted.

Bug: v8:7748
Change-Id: Iaf40d5be7bbfa80535cec9109c7dd19a9d96edaf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2526387
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71091}