Update V8 to version 6.0.42.

Summary of changes available at:
https://chromium.googlesource.com/v8/v8/+log/13c713b9..d5624ab6

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.

CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel

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Review-Url: https://codereview.chromium.org/2833723002
Cr-Commit-Position: refs/heads/master@{#465956}
diff --git a/DEPS b/DEPS
index d41a4b9e..bc6637d 100644
--- a/DEPS
+++ b/DEPS
@@ -44,7 +44,7 @@
   # 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': '13c713b9a19358734d53f50b93157818218627db',
+  'v8_revision': 'd5624ab6fef57f0ec8761ae8f700be1ff3306e91',
   # 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.