Update V8 to version 8.2.7.

Summary of changes available at:
https://chromium.googlesource.com/v8/v8/+log/43c981c9..842c4bc2

Please follow these instructions for assigning/CC'ing issues:
https://v8.dev/docs/triage-issues

Please close rolling in case of a roll revert:
https://v8-roll.appspot.com/
This only works with a Google account.

TBR=hablich@chromium.org,v8-waterfall-sheriff@grotations.appspotmail.com

Change-Id: Ifecf3d46f7bc4194e3b67ec9730e193bf7396c25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037374
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#738171}

DEPS

@@ -180,7 +180,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.
-  'v8_revision': '43c981c95dc071f5e1fd8392c8d735ab33fa7e13',
+  'v8_revision': '842c4bc23d4ebf75589ed964ba1c2af057137d4c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling swarming_client
   # and whatever else without interference from each other.