Initialize using the base location provided by the derived implementation, not the default one (which is always empty).
Initialize using the base location provided by the derived implementation,
not the default one (which is always empty).



git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@84721 91177308-0d34-0410-b5e6-96231b3b80d8

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