Add an assert to make sure that we don't try to mess with overridden methods for class templates.
Add an assert to make sure that we don't try to mess with overridden methods for class templates.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@94907 91177308-0d34-0410-b5e6-96231b3b80d8

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