Update V8 to version 7.3.74.

Summary of changes available at:
https://chromium.googlesource.com/v8/v8/+log/6d924c33..970a38a9

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=luci.chromium.try:linux-blink-rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel;luci.chromium.try:android_optional_gpu_tests_rel

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Change-Id: Ia2cc735b04e54b01194e80b1cfcd28bad8c88110
Reviewed-on: https://chromium-review.googlesource.com/c/1369129
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#614964}
diff --git a/DEPS b/DEPS
index 9b86239..74c4ee1b 100644
--- a/DEPS
+++ b/DEPS
@@ -118,7 +118,7 @@
   # 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': '6d924c335aef7d39c94fb1cec169d720c0b97cfa',
+  'v8_revision': '970a38a9f5507e6bb13de895ab77cd89c33105ee',
   # 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.