Disable hints in dart2js-with-kernel

Change-Id: Id218b5116c134f7d1646f7d51ccef3faccd072f6
Reviewed-on: https://dart-review.googlesource.com/40469
Reviewed-by: Harry Terkelsen <het@google.com>
Commit-Queue: Sigmund Cherem <sigmund@google.com>

pkg/compiler/lib/src/dart2js.dart

@@ -289,6 +289,8 @@ Future<api.CompilationResult> compile(List<String> argv,
 
   void setUseKernel(String argument) {
     useKernel = true;
+    // TODO(sigmund): reenable hints (Issue #32111)
+    showHints = false;
     passThrough(argument);
   }