Use the return value of vm native methods to set the return value,

vm/code_descriptors_test.cc

Index: vm/code_descriptors_test.cc
===================================================================
--- vm/code_descriptors_test.cc	(revision 11528)
+++ vm/code_descriptors_test.cc	(working copy)
@@ -182,18 +182,22 @@
 CODEGEN_TEST_RUN(StackmapCodegen, Smi::New(1))
 
 
-DEFINE_NATIVE_ENTRY(NativeFunc, 2) {
-  GET_NATIVE_ARGUMENT(Smi, i, arguments->At(0));
-  GET_NATIVE_ARGUMENT(Smi, k, arguments->At(1));
-  EXPECT_EQ(10, i.Value());
-  EXPECT_EQ(20, k.Value());
+static void NativeFunc(Dart_NativeArguments args) {
+  Dart_EnterScope();
+  Dart_Handle i = Dart_GetNativeArgument(args, 0);
+  Dart_Handle k = Dart_GetNativeArgument(args, 1);
+  int64_t value = -1;
+  EXPECT_VALID(Dart_IntegerToInt64(i, &value));
+  EXPECT_EQ(10, value);
+  EXPECT_VALID(Dart_IntegerToInt64(k, &value));
+  EXPECT_EQ(20, value);
   Isolate::Current()->heap()->CollectAllGarbage();
 }
 
 
 static Dart_NativeFunction native_resolver(Dart_Handle name,
                                            int argument_count) {
-  return reinterpret_cast<Dart_NativeFunction>(&DN_NativeFunc);
+  return reinterpret_cast<Dart_NativeFunction>(&NativeFunc);
 }