Add missing include to fix build issues on master-next and master-rebranch

Nathan Hawes · Nathan Hawes · commit 3aa4f74981c7 · 2020-08-06T11:30:23.000-07:00
diff --git a/include/swift/AST/DiagnosticEngine.h b/include/swift/AST/DiagnosticEngine.h
@@ -24,6 +24,7 @@
 #include "swift/AST/TypeLoc.h"
 #include "llvm/ADT/StringSet.h"
 #include "llvm/Support/Allocator.h"
+#include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/VersionTuple.h"
 
