Correct pass ordering validation timing.

PiperOrigin-RevId: 611330702

Author: concavelenz

src/com/google/javascript/jscomp/DefaultPassConfig.java

@@ -491,15 +491,16 @@ protected PassListBuilder getChecks() {
     // See b/180424427 for why this runs in stage 1 and not stage 2.
     checks.maybeAdd(gatherExternPropertiesCheck);
 
-    checks.assertAllOneTimePasses();
-    assertValidOrderForChecks(checks);
-
     checks.maybeAdd(createEmptyPass(PassNames.BEFORE_SERIALIZATION));
 
     if (options.getTypedAstOutputFile() != null) {
       checks.maybeAdd(serializeTypedAst);
     }
 
+    // Validation should be after all pass additions
+    checks.assertAllOneTimePasses();
+    assertValidOrderForChecks(checks);
+
     return checks;
   }