Tracking Tmps is expensive, tracking Regs is cheap. We sometimes need to compute liveness of Regs only. That should be cheap and not expensive.
Created attachment 268660 [details]
Not ready for review yet because I haven't run all of the tests yet.
Attachment 268660 [details] did not pass style-queue:
Total errors found: 1 in 9 files
If any of these errors are false positives, please file a bug against check-webkit-style.
Comment on attachment 268660 [details]
View in context: https://bugs.webkit.org/attachment.cgi?id=268660&action=review
> + BitVector other than this, so it doesn't make sense to made it harder to access.
Landed in http://trac.webkit.org/changeset/194834