[NFC] Add InputInfo::makeNeedsCascadingRebuild

Author: CodaFi

include/swift/Driver/Action.h

@@ -146,7 +146,11 @@ class IncrementalJobAction : public JobAction {
         : status(stat), previousModTime(time) {}
 
     static InputInfo makeNewlyAdded() {
-      return InputInfo(Status::NewlyAdded, llvm::sys::TimePoint<>::max());
+      return {Status::NewlyAdded, llvm::sys::TimePoint<>::max()};
+    }
+
+    static InputInfo makeNeedsCascadingRebuild() {
+      return {Status::NeedsCascadingBuild, llvm::sys::TimePoint<>::min()};
     }
   };