[objc-arc-opts] Encapsulated PtrState.RRI.{Calls,ReverseInsertPts} into several methods on PtrState.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184586 91177308-0d34-0410-b5e6-96231b3b80d8
[objc-arc-opts] Now that PtrState.RRI is encapsulated in PtrState, make PtrState.RRI private and delete the TODO.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184587 91177308-0d34-0410-b5e6-96231b3b80d8