Auto create ApiLocalScope before calling native functions, this ensures that

runtime/vm/code_descriptors_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 
 #include "vm/ast.h"
 #include "vm/assembler.h"
 #include "vm/code_descriptors.h"
@@ skipping 164 matching lines @@
   } else {
     retval = false;
   }
   EXPECT(retval);
   isolate->set_long_jump_base(base);
 }
 CODEGEN_TEST_RUN(StackmapCodegen, Smi::New(1))
 
 
 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();
-  Dart_ExitScope();
 }
 
 
 static Dart_NativeFunction native_resolver(Dart_Handle name,
                                            int argument_count) {
   return reinterpret_cast<Dart_NativeFunction>(&NativeFunc);
 }
 
 
 TEST_CASE(StackmapGC) {
@@ skipping 71 matching lines @@
 
   // Now invoke 'A.moo' and it will trigger a GC when the native function
   // is called, this should then cause the stack map of function 'A.foo'
   // to be traversed and the appropriate objects visited.
   const Object& result = Object::Handle(
       DartEntry::InvokeFunction(function_foo, Object::empty_array()));
   EXPECT(!result.IsError());
 }
 
 }  // namespace dart
-