This reverts commit r296712. It broke our bot. It turns out that the test is passing with c++11 and c++14 but not c++1z on this particular version of the compiler. Since one job is defaulting to c++1z and the other is testing all config I'm not sure how to fix this... git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@296724 91177308-0d34-0410-b5e6-96231b3b80d8