Small tweaks to hot reload testing

tools/testing/dart/test_suite.dart

Index: tools/testing/dart/test_suite.dart
diff --git a/tools/testing/dart/test_suite.dart b/tools/testing/dart/test_suite.dart
index c73dc7c28841b77b49774be1b91550146699059b..70230f4983ad348c0f46fa42e51d107c5b665256 100644
--- a/tools/testing/dart/test_suite.dart
+++ b/tools/testing/dart/test_suite.dart
@@ -300,6 +300,14 @@ abstract class TestSuite {
       return;
     }
 
+    if (configuration['hot_reload']) {
+      // Handle reload special cases.
+      if (expectations.contains(Expectation.COMPILETIME_ERROR)) {
+        // Skip reloading tests with expected compilation errors.
+        return;
+      }
+    }
+
     // Update Summary report
     if (configuration['report']) {
       if (testCase.expectCompileError &&