Do not embed is_auto_setup_scope into the compilation of native calls.

runtime/vm/intermediate_language_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"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/compiler.h"
@@ skipping 830 matching lines @@
                              kWordSize));
   } else {
     __ leal(EAX, Address(EBP, kFirstLocalSlotFromFp * kWordSize));
   }
   __ movl(EDX, Immediate(argc_tag));
 
   const StubEntry* stub_entry;
 
   // There is no lazy-linking support on ia32.
   ASSERT(!link_lazily());
-  stub_entry = (is_bootstrap_native())
-                   ? StubCode::CallBootstrapCFunction_entry()
-                   : StubCode::CallNativeCFunction_entry();
+  if (is_bootstrap_native()) {
+    stub_entry = StubCode::CallBootstrapNative_entry();
+  } else if (is_auto_scope()) {
+    stub_entry = StubCode::CallAutoScopeNative_entry();
+  } else {
+    stub_entry = StubCode::CallNoScopeNative_entry();
+  }
   const ExternalLabel label(reinterpret_cast<uword>(native_c_function()));
   __ movl(ECX, Immediate(label.address()));
   compiler->GenerateCall(token_pos(), *stub_entry, RawPcDescriptors::kOther,
                          locs());
 
   __ popl(result);
 }
 
 
 static bool CanBeImmediateIndex(Value* value, intptr_t cid) {
@@ skipping 6026 matching lines @@
   __ Drop(1);
   __ popl(result);
 }
 
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_IA32