Bug 1642629 - Reserve sorted polygon list before pushing know number of split planes into it. r=gw
Bug 1642629 - Reserve sorted polygon list before pushing know number of split planes into it. r=gw

Differential Revision: https://phabricator.services.mozilla.com/D80438

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/e891a846e7f31ca81271dfeff1b5c501a61f3111

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