deps: update V8 to 6.4
Floating two patches that have not yet landed upstream:
-
https://chromium-review.googlesource.com/c/v8/v8/+/804554 -
Merge request: https://bugs.chromium.org/p/v8/issues/detail?id=7191
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-
https://chromium-review.googlesource.com/c/v8/v8/+/806774 -
Merge request: https://bugs.chromium.org/p/v8/issues/detail?id=7198
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Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
V8, build
CI: https://ci.nodejs.org/job/node-test-pull-request/11908/ V8: https://ci.nodejs.org/job/node-test-commit-v8-linux/1101/