This is a tracking bug for blockers of the 3.9.0 release.
I think the fix in https://reviews.llvm.org/D22543 should also be a release blocker.
D22543 has been merged as r276462.
Added bug 28617 (crashes compiling XRandR and JasPer).
Closing. Use PR30261 for 3.9.1 issues.