Stop using random_shuffle in the libc++ test suite. It's going to be removed in c++17. Use shuffle() instead. No change to libc++, just the tests.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@294328 91177308-0d34-0410-b5e6-96231b3b80d8
29 files changed