Driver: Basic argument parsing.
 - Add Driver::ParseArgStrings.
 - Store values directly in CommaJoinedArg to support simple access.
 - Add FlagArg class.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@66142 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed