Add 'REQUIERS: long_tests' to a few more long tests

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224064 91177308-0d34-0410-b5e6-96231b3b80d8
Add 'REQUIRES: long_tests' to one more long test

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224069 91177308-0d34-0410-b5e6-96231b3b80d8