wpa is an experiment, don't build it by default, it adds to build times due to everything it links in.
wpa is an experiment, don't build it by default, it adds to build times due to everything it links in.


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@82704 91177308-0d34-0410-b5e6-96231b3b80d8

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