Fix 2 problems with Chris Lattner's FileManager redesign on Windows.

- FileEntry::operator= is needed on Win32.
- There was an error in the S_ISDIR() macro.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@120079 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed