Don't look up decls with no name (such as parameters and unnamed tagged types), this removes 4266 calls to LookupDecl.
Don't look up decls with no name (such as parameters and unnamed tagged types),
this removes 4266 calls to LookupDecl.


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@62662 91177308-0d34-0410-b5e6-96231b3b80d8

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