A certain class of pages can improve greatly with this. Since 45 has mozilla/LinkedList.h, we should be able to just use 52ESR's implementation (45ESR already has RefPtr<>, so that change actually doesn't apply). Then we can land 1350770, which further improves performance.
https://bugzilla.mozilla.org/show_bug.cgi?id=1350770
A certain class of pages can improve greatly with this. Since 45 has
mozilla/LinkedList.h, we should be able to just use 52ESR's implementation (45ESR already hasRefPtr<>, so that change actually doesn't apply). Then we can land 1350770, which further improves performance.https://bugzilla.mozilla.org/show_bug.cgi?id=1350770