[objc-arc] Extract out state specific to a ref count from the main objc arc sequence dataflow. This will allow me to separate the actual ARC queries from the meat of the dataflow algorithm.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231426 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed