Add a new RetainReleaseChecker class (that subclasses CheckerVisitor) to extend the functionality of the retain/release checker using the new Checker interface.  Pieces of CFRefCount will gradually be migrated to this new class over time.
Add a new RetainReleaseChecker class (that subclasses CheckerVisitor) to extend the functionality of the retain/release checker using the new Checker interface.  Pieces of CFRefCount will gradually be migrated to this new class over time.


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@89889 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang