Consumed analyis: Renamed *PStatus to *PInfo.
The change was made for readability, as the PropagationInfo objects don't
always contain a status.  This is submitted as a separate patch because it
touches a lot of lines and I don't want it cluttering up the next patch.
Patch by chris.wailes@gmail.com.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@189278 91177308-0d34-0410-b5e6-96231b3b80d8