Make regression test actually excercise rerunning only some queries

tests/incremental/rpitit-feeding.rs

@@ -1,4 +1,4 @@
-// revisions: cpass cpass2
+// revisions: cpass cpass2 cpass3
 
 // This test checks that creating a new `DefId` from within a query `A`
 // recreates that `DefId` before reexecuting queries that depend on query `A`.
@@ -13,10 +13,18 @@ trait Foo {
     fn foo() -> impl Sized;
 }
 
+#[cfg(any(cpass, cpass3))]
 impl Foo for String {
     fn foo() -> i32 {
         22
     }
 }
 
+#[cfg(cpass2)]
+impl Foo for String {
+    fn foo() -> u32 {
+        22
+    }
+}
+
 fn main() {}