Rename time.duration.literals step 3

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@187905 91177308-0d34-0410-b5e6-96231b3b80d8
War on tabs

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@187906 91177308-0d34-0410-b5e6-96231b3b80d8