Updated status of issues #2028, 2047, and 2053.


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@188810 91177308-0d34-0410-b5e6-96231b3b80d8
Updated status and description of issues 2064, 2069 and 2096.


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@188811 91177308-0d34-0410-b5e6-96231b3b80d8