Second codegen test passing on ARM (simulated).

runtime/vm/native_arguments.h

 // 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.
 
 #ifndef VM_NATIVE_ARGUMENTS_H_
 #define VM_NATIVE_ARGUMENTS_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
+#include "vm/simulator.h"
 #include "vm/stub_code.h"
 
 namespace dart {
 
 // Forward declarations.
 class BootstrapNatives;
 class Isolate;
 class Object;
 class RawObject;
 class Simulator;
 
 
 #if defined(TESTING) || defined(DEBUG)
 
-#if defined(TARGET_OS_WINDOWS)
+#if defined(USING_SIMULATOR)
+#define CHECK_STACK_ALIGNMENT {                                                \
+  uword current_sp = Simulator::Current()->get_register(SPREG);                \
+  ASSERT((OS::ActivationFrameAlignment() == 0) ||                              \
+         (Utils::IsAligned(current_sp, OS::ActivationFrameAlignment())));      \
+}
+#elif defined(TARGET_OS_WINDOWS)
 // The compiler may dynamically align the stack on Windows, so do not check.
 #define CHECK_STACK_ALIGNMENT { }
 #else
 #define CHECK_STACK_ALIGNMENT {                                                \
   uword (*func)() =                                                            \
       reinterpret_cast<uword (*)()>(StubCode::GetStackPointerEntryPoint());    \
   uword current_sp = func();                                                   \
   ASSERT((OS::ActivationFrameAlignment() == 0) ||                              \
          (Utils::IsAligned(current_sp, OS::ActivationFrameAlignment())));      \
 }
@@ skipping 128 matching lines @@
 
   Isolate* isolate_;  // Current isolate pointer.
   int argc_tag_;  // Encodes argument count and invoked native call type.
   RawObject*(*argv_)[];  // Pointer to an array of arguments to runtime call.
   RawObject** retval_;  // Pointer to the return value area.
 };
 
 }  // namespace dart
 
 #endif  // VM_NATIVE_ARGUMENTS_H_