[mlir][Python] Don't attempt to load builtin dialect

mlir/lib/Bindings/Python/Globals.cpp

diff --git a/mlir/lib/Bindings/Python/Globals.cpp b/mlir/lib/Bindings/Python/Globals.cpp
index 73e08c6..9ec1c85 100644
--- a/mlir/lib/Bindings/Python/Globals.cpp
+++ b/mlir/lib/Bindings/Python/Globals.cpp
@@ -62,6 +62,9 @@
 }
 
 bool PyGlobals::loadDialectModule(std::string_view dialectNamespace) {
+  if (dialectNamespace == "builtin")
+    return true;
+
   {
     nb::ft_lock_guard lock(mutex);
     std::string dialectNamespaceStr(dialectNamespace);