Do not embed is_auto_setup_scope into the compilation of native calls.

runtime/vm/intermediate_language_dbc.cc

 // Copyright (c) 2016, 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_DBC.
 #if defined(TARGET_ARCH_DBC)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/cpu.h"
@@ skipping 951 matching lines @@
   ASSERT(!link_lazily());
   const ExternalLabel label(reinterpret_cast<uword>(native_c_function()));
   const intptr_t target_kidx =
       __ object_pool_wrapper().FindNativeEntry(&label, kNotPatchable);
   const intptr_t argc_tag_kidx =
       __ object_pool_wrapper().FindImmediate(static_cast<uword>(argc_tag));
   __ PushConstant(target_kidx);
   __ PushConstant(argc_tag_kidx);
   if (is_bootstrap_native()) {
     __ NativeBootstrapCall();
+  } else if (is_auto_scope()) {
+    __ NativeAutoScopeCall();
   } else {
-    __ NativeCall();
+    __ NativeNoScopeCall();
   }
   compiler->RecordSafepoint(locs());
   compiler->AddCurrentDescriptor(RawPcDescriptors::kOther, Thread::kNoDeoptId,
                                  token_pos());
 }
 
 
 EMIT_NATIVE_CODE(OneByteStringFromCharCode,
                  1,
                  Location::RequiresRegister(),
@@ skipping 1066 matching lines @@
   }
   __ IfULe(length, index);
   compiler->EmitDeopt(deopt_id(), ICData::kDeoptCheckArrayBound,
                       (generalized_ ? ICData::kGeneralized : 0) |
                           (licm_hoisted_ ? ICData::kHoisted : 0));
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_DBC