VM: Replace dart --noopt with new binary target dart_noopt.

tools/testing/dart/runtime_configuration.dart

Index: tools/testing/dart/runtime_configuration.dart
diff --git a/tools/testing/dart/runtime_configuration.dart b/tools/testing/dart/runtime_configuration.dart
index 2978003369e1da3c254d781943598e26674161c0..19fcdda982198a3b576f0d2326a25653d6898027 100644
--- a/tools/testing/dart/runtime_configuration.dart
+++ b/tools/testing/dart/runtime_configuration.dart
@@ -218,8 +218,11 @@ class StandaloneDartRuntimeConfiguration extends DartVmRuntimeConfiguration {
     if (script != null && type != 'application/dart') {
       throw "Dart VM cannot run files of type '$type'.";
     }
+    String executable = suite.configuration['noopt'] 
+        ? suite.dartVmNooptBinaryFileName
+        : suite.dartVmBinaryFileName;
     return <Command>[commandBuilder.getVmCommand(
-          suite.dartVmBinaryFileName, arguments, environmentOverrides)];
+          executable, arguments, environmentOverrides)];
   }
 }