Merging r247083:

------------------------------------------------------------------------
r247083 | echristo | 2015-09-08 18:14:58 -0400 (Tue, 08 Sep 2015) | 3 lines

Fix the PPC CTR Loop pass to look for calls to the intrinsics that
read CTR and count them as reading the CTR.

------------------------------------------------------------------------

llvm-svn: 252511