<rdar://problem/44800928>
Created attachment 350933 [details] proposed patch.
Thanks for the review. Landed in r236538: <http://trac.webkit.org/r236538>.
Comment on attachment 350933 [details] proposed patch. I think this might be a little more clear if you introduced a new ENABLE macro specifically for SeparatedWXHeap, an ENABLE_ SEPARATED_WXHEAP.