[modules] Don't bother looking up a declaration to merge into if we're not actually loading a formerly-canonical declaration.
[modules] Don't bother looking up a declaration to merge into if we're not
actually loading a formerly-canonical declaration.


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@231742 91177308-0d34-0410-b5e6-96231b3b80d8

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