Add matchers for selected C++11 features.

Patch by Gábor Horváth.
Review: http://llvm-reviews.chandlerc.com/D46

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@164943 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed