deps: V8: cherry-pick fe191e8d05cc

An unexercised optional chain did not count as a missed branch:

Before:

After:

Original commit message:

[coverage] optional chaining coverage

Implement coverage tracking for optional chains.

Bug: v8:10060
Change-Id: I4f29eda64b6d859939f5f58f4fabead649905795
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2573013
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Gus Caplan <snek@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Benjamin Coe <bencoe@google.com>
Cr-Commit-Position: refs/heads/master@{#72075}

Refs: https://github.com/v8/v8/commit/fe191e8d05ccfa740432f56d34b1ff2d32265a8d