Fix bugs for linux-x64-fuzzilli-coverage

With these changes, linux-x64-fuzzilli-coverage was able to run
the tests for >4 hours [1], but eventually failed. Land these
changes first then setup a x86 builder which has less corpora torun, thus easier to debug.

[1] https://ci.chromium.org/ui/p/chromium/builders/ci.shadow/linux-x64-fuzzilli-coverage/8/overview

Bug: 395162693
Change-Id: I14cb4f0ec04971855d9665c2eb7886e097529644
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6322892
Reviewed-by: Prakhar Asthana <[email protected]>
Commit-Queue: Prakhar Asthana <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1428591}
NOKEYCHECK=True
GitOrigin-RevId: 336df3f9cc314b28b49d3edd69c71e345aac5a68
1 file changed