Rework leaf calls as just simple C calls with a signature and not the NativeArgumentDescriptor.

vm/assembler_ia32.cc

 // Copyright (c) 2011, 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 "vm/globals.h"
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/assembler.h"
 #include "vm/heap.h"
 #include "vm/memory_region.h"
@@ skipping 1383 matching lines @@
   // Check that 'value' is a new object.  Store buffer updates are not
   // required when storing a smi or an old object.
   testl(value, Immediate(kNewObjectAlignmentOffset | kHeapObjectTag));
   j(PARITY_ODD, &done, Assembler::kNearJump);
   // Check that 'object' is an old object.  A store buffer update is
   // not required when storing into a new object.
   testl(object, Immediate(kNewObjectAlignmentOffset));
   j(NOT_ZERO, &done, Assembler::kNearJump);
   // A store buffer update is required.
   pushal();
-  pushl(dest);  // Push argument
+  movl(EBP, ESP);
+  ReserveAlignedFrameSpace(kWordSize);
+  movl(EAX, dest);
+  movl(Address(ESP, 0), EAX);  // Push argument
   CallRuntime(kStoreBufferRuntimeEntry);
-  popl(value);  // Pop argument
+  movl(ESP, EBP);
   popal();
   Bind(&done);
 }
 
 
 void Assembler::StoreIntoObjectNoBarrier(Register object,
                                          const FieldAddress& dest,
                                          Register value) {
   movl(dest, value);
 #if 0  // TODO(cshapiro) Turn this back on after it is fixed defined(DEBUG).
@@ skipping 79 matching lines @@
   }
 }
 
 
 void Assembler::LeaveFrame() {
   movl(ESP, EBP);
   popl(EBP);
 }
 
 
+void Assembler::ReserveAlignedFrameSpace(intptr_t frame_space) {
+  // Reserve space for arguments and align frame before entering
+  // the C++ world.
+  AddImmediate(ESP, Immediate(-frame_space));
+  if (OS::ActivationFrameAlignment() > 0) {
+    andl(ESP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
+  }
+}
+
+
 void Assembler::CallRuntime(const RuntimeEntry& entry) {
   entry.Call(this);
 }
 
 
 void Assembler::Align(int alignment, int offset) {
   ASSERT(Utils::IsPowerOfTwo(alignment));
   int pos = offset + buffer_.GetPosition();
   int mod = pos & (alignment - 1);
   if (mod == 0) {
@@ skipping 202 matching lines @@
     comments.SetCommentAt(i, comments_[i]->comment());
   }
 
   return comments;
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32