[clang] [flang] [llvm] [llvm] Lift VFS from `PGOOptions` to `PassBuilder` (PR #160188)

[Jan Svoboda via cfe-commits]

================
@@ -27,6 +27,8 @@
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/Support/Debug.h"
 
+#include <atomic>
----------------
jansvoboda11 wrote:

Yes, this relied on a transitive include of `PGOOptions.h` that used to include `IntrusiveRefCntPtr.h` that includes `<atomic>`. But since `PGOOptions.h` has lost the (now unnecessary) include, this broke.

https://github.com/llvm/llvm-project/pull/160188