Add chlo dialect to auto input conversion pipeline (iree-org#15474)

`chlo` operations should be checked for with the `stablehlo` part of the
auto input conversion pipeline.

compiler/src/iree/compiler/InputConversion/Common/AutoInputConversionPipeline.cpp

@@ -82,11 +82,12 @@ static void populateHloFeatures(Operation *op, InputFeatures &features) {
   }
 }
 
-static void populateFeatures(Operation *op, const Dialect *stablehloDialect,
+static void populateFeatures(Operation *op, const Dialect *chloDialect,
+                             const Dialect *stablehloDialect,
                              const Dialect *tosaDialect,
                              InputFeatures &features) {
   Dialect *d = op->getDialect();
-  if (d == stablehloDialect) {
+  if (d == stablehloDialect || d == chloDialect) {
     features.hasStableHLO = true;
     return populateHloFeatures(op, features);
   }
@@ -101,14 +102,15 @@ void AutoInputConversionPipelinePass::runOnOperation() {
   MLIRContext *ctxt = &getContext();
 
   InputFeatures features;
+  const Dialect *chloDialect = ctxt->getLoadedDialect("chlo");
   const Dialect *stablehloDialect = ctxt->getLoadedDialect("stablehlo");
   const Dialect *tosaDialect = ctxt->getLoadedDialect("tosa");
-  if (!stablehloDialect && !tosaDialect) {
+  if (!chloDialect && !stablehloDialect && !tosaDialect) {
     return;
   }
 
   auto res = module.walk([&](Operation *op) {
-    populateFeatures(op, stablehloDialect, tosaDialect, features);
+    populateFeatures(op, chloDialect, stablehloDialect, tosaDialect, features);
     if (features.hasStableHLO && features.hasTOSA) {
       module.emitError("not yet implemented mixture of *HLO and TOSA");
       return WalkResult::interrupt();