Rearrange and simplify some JSC feature flags
Created attachment 395735 [details] Patch
Created attachment 395761 [details] Patch
Comment on attachment 395761 [details] Patch r=me
Committed r259711: <https://trac.webkit.org/changeset/259711> All reviewed patches have been landed. Closing bug and clearing flags on attachment 395761 [details].
<rdar://problem/61442460>