[Diffusion] rL246882: Don't crash on a self-alias declaration

[John McCall via cfe-commits]

rjmccall added a subscriber: rjmccall.
rjmccall added a comment.

Hmm.  That cast to GlobalAlias seems quite brittle anyway; it would be good to fix it (and diagnose the fact that forming the alias failed).  But this change seems independently useful.

Approved for 3.7.


Users:
  hfinkel (Author, Auditor)
  3.7-release (Auditor)
  cfe-commits (Auditor)
  tstellarAMD (Auditor)
  rjmccall (Auditor)

http://reviews.llvm.org/rL246882