It seems that currently the (growing list) of JIT enabled platforms are listed twice in Platform.h. This is error-prone (for example r58939) and hard to read. It make sense to turn on YARR and YARR JIT by default of JIT is turned on - individual ports can overrule this default decisions as they wish.
Created attachment 55342 [details] proposed patch
Comment on attachment 55342 [details] proposed patch Clearing flags on attachment: 55342 Committed r59041: <http://trac.webkit.org/changeset/59041>
All reviewed patches have been landed. Closing bug.