Move the J2clPass from late checks to early optimizations

It was originallly in checks to allow it to run before generator transpilation, but generator transpilation has since been moved to the optimizations phase.

PiperOrigin-RevId: 545769000

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

@@ -482,9 +482,6 @@ protected PassListBuilder getChecks() {
       checks.maybeAdd(removeSyntheticScript);
     } else if (!options.checksOnly) {
       checks.maybeAdd(mergeSyntheticScript);
-      if (options.j2clPassMode.shouldAddJ2clPasses()) {
-        checks.maybeAdd(j2clPass);
-      }
       // At this point all checks have been done.
       if (options.exportTestFunctions) {
         checks.maybeAdd(exportTestFunctions);
@@ -559,6 +556,10 @@ protected PassListBuilder getOptimizations() {
     // This is expected to do nothing when in a monolithic build
     passes.maybeAdd(removeUnnecessarySyntheticExterns);
 
+    if (options.j2clPassMode.shouldAddJ2clPasses()) {
+      passes.maybeAdd(j2clPass);
+    }
+
     TranspilationPasses.addTranspilationRuntimeLibraries(passes);
 
     if (options.rewritePolyfills || options.getIsolatePolyfills()) {
@@ -1286,11 +1287,6 @@ private void assertValidOrderForChecks(PassListBuilder checks) {
         gatherModuleMetadataPass,
         checkMissingRequires,
         "Need to gather module information before checking for missing requires.");
-
-    checks.assertPassOrder(
-        j2clPass,
-        TranspilationPasses.rewriteGenerators,
-        "J2CL normalization should be done before generator re-writing.");
   }
 
   /**
@@ -1301,6 +1297,11 @@ private void assertValidOrderForChecks(PassListBuilder checks) {
    * @param optimizations The list of optimization passes
    */
   private void assertValidOrderForOptimizations(PassListBuilder optimizations) {
+    optimizations.assertPassOrder(
+        j2clPass,
+        TranspilationPasses.rewriteGenerators,
+        "J2CL normalization should be done before generator re-writing.");
+
     optimizations.assertPassOrder(
         TranspilationPasses.rewritePolyfills,
         processDefinesOptimize,