[JSC] Add branchIfNaN and branchIfNotNaN
Created attachment 351232 [details] Patch
Comment on attachment 351232 [details] Patch r=me
Comment on attachment 351232 [details] Patch nice
Thanks for your review :)
Committed r236734: <https://trac.webkit.org/changeset/236734>
<rdar://problem/44935262>