Revert "ADT: Remove references in has_rbegin for reverse()"

This reverts commit r279084, since it failed on a bot:
  http://bb.pgr.jp/builders/cmake-llvm-x86_64-linux/builds/41733

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279086 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed