[Support] Add a GTest matcher for Optional<T>

Reviewers: sammccall

Reviewed By: sammccall

Subscribers: mgorny, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D61071

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@359174 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed