Load the native call wrapper via Thread.

runtime/vm/stub_code_ia32.cc

 // Copyright (c) 2013, 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/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 161 matching lines @@
   // Pass NativeArguments structure by value and call native function.
   __ movl(Address(ESP, thread_offset), THR);  // Set thread in NativeArgs.
   __ movl(Address(ESP, argc_tag_offset), EDX);  // Set argc in NativeArguments.
   __ movl(Address(ESP, argv_offset), EAX);  // Set argv in NativeArguments.
   __ leal(EAX, Address(EBP, 2 * kWordSize));  // Compute return value addr.
   __ movl(Address(ESP, retval_offset), EAX);  // Set retval in NativeArguments.
   __ leal(EAX, Address(ESP, 2 * kWordSize));  // Pointer to the NativeArguments.
   __ movl(Address(ESP, 0), EAX);  // Pass the pointer to the NativeArguments.
 
   __ movl(Address(ESP, kWordSize), ECX);  // Function to call.
-  __ call(&NativeEntry::NativeCallWrapperLabel());
+  ExternalLabel label(NativeEntry::NativeCallWrapperEntry());
+  __ call(&label);
 
   // Mark that the isolate is executing Dart code. EDI is callee saved.
   __ movl(Address(EDI, Isolate::vm_tag_offset()),
           Immediate(VMTag::kDartTagId));
 
   // Reset exit frame information in Isolate structure.
   __ movl(Address(THR, Thread::top_exit_frame_info_offset()), Immediate(0));
 
   __ LeaveFrame();
   __ ret();
@@ skipping 1896 matching lines @@
 //  EBX: entry point.
 void StubCode::GenerateMegamorphicLookupStub(Assembler* assembler) {
   EmitMegamorphicLookup(assembler, ECX, EBX, EBX);
   __ ret();
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32