Better stack trace support

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 dfaa87289a5dfd7627c916505da391177ec4472b..474535ada12ba8127ea2f3093cefccf5c286d426 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
@@ -88,6 +88,13 @@ throwAssertionError([message]) => JS(
   $throw_(error);
 })()''');
 
+throwCyclicInitializationError([message]) => JS(

[Jennifer Messerly, 2017/05/05 23:59:15]

I know this is the style of all these helpers but ... fyi ... I think this could
be written simply as:


throwCyclicInitializationError([String message]) {
  if (_trapRuntimeErrors) JS('', 'debugger');
  throw new CyclicInitializationError(message);
}


... only thing to watch out for in these is to avoid implicit casts for the most
part.

[vsm, 2017/05/08 17:07:44]

Done.

+    '',
+    '''(() => {
+  if ($_trapRuntimeErrors) debugger;
+  $throw_(new $CyclicInitializationError($message));
+})()''');
+
 throwNullValueError() => JS(
     '',
     '''(() => {