Add option to suppress type-check whitelisting

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/errors.dart

Index: pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/errors.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/errors.dart b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/errors.dart
index 49bc1cc11afb09fdf88249a0a93b02af77434ae4..b432d3eaf214653eb79bf07de6c4b5d1e78d8768 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/errors.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/errors.dart
@@ -4,12 +4,17 @@
 part of dart._runtime;
 
 bool _trapRuntimeErrors = true;
+bool _ignoreWhitelistedErrors = true;
 
 // Override, e.g., for testing
 void trapRuntimeErrors(bool flag) {
   _trapRuntimeErrors = flag;
 }
 
+void ignoreWhitelistedErrors(bool flag) {
+  _ignoreWhitelistedErrors = flag;
+}
+
 throwCastError(object, actual, type) => JS('', '''(() => {
   var found = $typeName($actual);
   var expected = $typeName($type);