Set the buffer of an fstream to empty when the underlying file is closed. This 'fixes' PR#38052 - std::fstream still good after closing and updating content.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@350603 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed