Repost checker-270, which for some reason got deleted.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171870 91177308-0d34-0410-b5e6-96231b3b80d8
Formatter: Add tests for some ObjC bits that happen to be formatted correctly.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171875 91177308-0d34-0410-b5e6-96231b3b80d8