Update V8 to version 5.1.163.

Summary of changes available at:
https://chromium.googlesource.com/v8/v8/+log/873938e2..79f4376c

Please follow these instructions for assigning/CC'ing issues:
https://github.com/v8/v8/wiki/Triaging%20issues

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,machenbach@chromium.org,yangguo@chromium.org,vogelheim@chromium.org

Review URL: https://codereview.chromium.org/1811083002

Cr-Commit-Position: refs/heads/master@{#381798}

DEPS

@@ -43,7 +43,7 @@ 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': '873938e2dd9668f95224273165408db5ed7d17e2',
+  'v8_revision': '79f4376c1dc9ceb909054620ffff7bc5d03464b1',
   # 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.