Added two missing headers from ObjCARCAliasAnalysis.h.

This was missed since whenever I was including ObjCARCAliasAnalysis.h, I
was including ObjCARC.h before it which included these includes
(resulting in no compilation breakage).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173764 91177308-0d34-0410-b5e6-96231b3b80d8