Bug 1731569 - Avoid SwComposite thread stack overflow with ASAN. r=jrmuizel
Bug 1731569 - Avoid SwComposite thread stack overflow with ASAN. r=jrmuizel

Differential Revision: https://phabricator.services.mozilla.com/D126256

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/7d88deecffae457b0bea29ff1a4faf016b11aaf8

servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender