Fix comment alignment close to the column limit.

Due to an error in one of the expressions, we used to not align comments
although it would have been possible.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@175068 91177308-0d34-0410-b5e6-96231b3b80d8
Use 'RC_XBS' instead of 'RC_BUILDIT' to catch all times when it's built in the Apple way.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@175070 91177308-0d34-0410-b5e6-96231b3b80d8