This fixes a bug in lazy deopts caused by calls to the callback function
in Array.prototype.reduce and reduceRight.

The deopt continuation expects the *next* iteration's index value but
we actually passed the current iteration's value.

The user-visible effect of this bug was that sometimes, an unexpected
additional call to the callback function would occur.

It was introduced by https://crrev.com/c/1934329.

Bug: v8:9972,chromium:1049982
Change-Id: Icfd2ef076209e20602f54d4662220e1d4c5d07ee
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2049850
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66226}