[Support] Remove a stale comment.

This comment was included in Peter Collingbourne's original version of
StringError (see http://reviews.llvm.org/D20550), where it made sense. It was
accidentally copied over with the rest of the class, but no longer applies.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@270956 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed