Improve hot reload test mode

tools/testing/dart/compiler_configuration.dart

Index: tools/testing/dart/compiler_configuration.dart
diff --git a/tools/testing/dart/compiler_configuration.dart b/tools/testing/dart/compiler_configuration.dart
index 76a0e5577764e0821831e205bfba20ff427f21b4..1747731c5a5de181f432e6159bedefdc712eabb0 100644
--- a/tools/testing/dart/compiler_configuration.dart
+++ b/tools/testing/dart/compiler_configuration.dart
@@ -180,10 +180,6 @@ class NoneCompilerConfiguration extends CompilerConfiguration {
     }
     if (hotReload) {
       args.add('--hot-reload-test-mode');
-      // Remove the following once known bugs with background compilation
-      // and OSR are fixed.
-      args.add('--no-background-compilation');
-      args.add('--no-osr');
     }
     return args
       ..addAll(vmOptions)