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

[Dimitry Andric via cfe-commits]

dim added a subscriber: dim.
dim added auditors: 3.7-release, cfe-commits, tstellarAMD, hfinkel.
dim added a comment.

This got reported again in PR25397, and occurs during compilation of mpich.  Looks like a good candidate for 3.7.1.


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

http://reviews.llvm.org/rL246882