Add operator- to Path's reverse_iterator. Needed for D19666

Reviewers: rafael, craig.topper, bogner

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D19724

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268062 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed