This commit fixes an issue with non-debug builds where adding an
attachment to the attachment list doesn't actually happen. This
causes all MPI_Win_detach calls to fail. The call was within an
assert which is optimized out in optimized builds.
Signed-off-by: Nathan Hjelm <hjelmn@google.com>
(cherry picked from commit 8ee80d885561c4349ab97725416613614d63c77f)
059c9614a6