Added -lines X:Y option to specify line range to process. This is a more human-friendly alternative to -offset and -length.

Differential Revision: http://llvm-reviews.chandlerc.com/D1160


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@186625 91177308-0d34-0410-b5e6-96231b3b80d8