When regexp match indices are enabled, we stash required data in the JSRegExpResult object,
and then build a JSRegExpResultIndices object lazily when the 'indices' property is
accessed.

This cl simply checks that fast and slow paths produce the same values for
result.indices and result.indices.groups.

Change-Id: I6322d8eaef4c6e5a0ed3a5aef8b2ff05ac2b2c7a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1763249Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Joshua Litt <joshualitt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63301}