CharacterClassConstructor::charClass() gets a little hot (1.2%) when loading twitter feeds, and we can avoid the copy altogether by using Vector::swap().
Created attachment 120512 [details]
Comment on attachment 120512 [details]
Attachment 120512 [details] did not pass chromium-ews (chromium-xvfb):
New failing tests:
Committed r103672: <http://trac.webkit.org/changeset/103672>