[dart] Disable constant-update-2018 experiment

See: https://github.com/dart-lang/sdk/issues/36639

Change-Id: I3b5bb4b032936776022f78bf22c4bd2b5bb7f0d1
diff --git a/runtime/dart/dart_kernel.gni b/runtime/dart/dart_kernel.gni
index 963b50e..9017f31 100644
--- a/runtime/dart/dart_kernel.gni
+++ b/runtime/dart/dart_kernel.gni
@@ -123,6 +123,10 @@
 
     script = _compiler_path
     args = invoker.args + [
+             # TODO(https://github.com/dart-lang/sdk/issues/36639):
+             # Remove when new constant eval supports dilp files.
+             "--enable-experiment=no-constant-update-2018",
+
              "--target",
              invoker.platform_name,
              "--platform",