Add return missing in r182855.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@182856 91177308-0d34-0410-b5e6-96231b3b80d8
The second step in the token refactoring.

Gets rid of AnnotatedToken, putting everything into FormatToken.
FormatTokens are created once, and only referenced by pointer.  This
enables multiple future features, like having tokens shared between
multiple UnwrappedLines (while there's still work to do to fully enable
that).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@182859 91177308-0d34-0410-b5e6-96231b3b80d8