[ObjC generics] Remove `__kindof` tests depending on reverted c7c63c5.
[ObjC generics] Remove `__kindof` tests depending on reverted c7c63c5.

rdar://problem/48188728

apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang