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
diff --git a/lib/Basic/FileSystemStatCache.cpp b/lib/Basic/FileSystemStatCache.cpp
index 14f762e..359e192 100644
--- a/lib/Basic/FileSystemStatCache.cpp
+++ b/lib/Basic/FileSystemStatCache.cpp
@@ -25,7 +25,7 @@
 using namespace clang;
 
 #if defined(_MSC_VER)
-#define S_ISDIR(s) (_S_IFDIR & s)
+#define S_ISDIR(s) ((_S_IFDIR & s) !=0)
 #endif
 
 /// FileSystemStatCache::get - Get the 'stat' information for the specified