Update V8 to version 6.5.254.

Summary of changes available at:
https://chromium.googlesource.com/v8/v8/+log/dc0a0f78..73c55f57

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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Change-Id: Id4bbc6ce1cd8ae36893f474210e95ba1761364d6
Reviewed-on: https://chromium-review.googlesource.com/871475
Reviewed-by: v8 autoroll <[email protected]>
Commit-Queue: v8 autoroll <[email protected]>
Cr-Commit-Position: refs/heads/master@{#529969}
diff --git a/DEPS b/DEPS
index f5a90623..90b0c79 100644
--- a/DEPS
+++ b/DEPS
@@ -83,7 +83,7 @@
   # 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': 'dc0a0f78419d087c1427a26d88ce067682d3be73',
+  'v8_revision': '73c55f57fe8506011ff854b15026ca765b669700',
   # 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.