Do not embed is_auto_setup_scope into the compilation of native calls.

runtime/vm/intermediate_language_mips.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_MIPS.
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/compiler.h"
@@ skipping 1016 matching lines @@
   } else {
     __ AddImmediate(A2, FP, kFirstLocalSlotFromFp * kWordSize);
   }
   // Compute the effective address. When running under the simulator,
   // this is a redirection address that forces the simulator to call
   // into the runtime system.
   uword entry;
   const intptr_t argc_tag = NativeArguments::ComputeArgcTag(function());
   const StubEntry* stub_entry;
   if (link_lazily()) {
-    stub_entry = StubCode::CallBootstrapCFunction_entry();
+    stub_entry = StubCode::CallBootstrapNative_entry();
     entry = NativeEntry::LinkNativeCallEntry();
   } else {
     entry = reinterpret_cast<uword>(native_c_function());
     if (is_bootstrap_native()) {
-      stub_entry = StubCode::CallBootstrapCFunction_entry();
+      stub_entry = StubCode::CallBootstrapNative_entry();
 #if defined(USING_SIMULATOR)
       entry = Simulator::RedirectExternalReference(
           entry, Simulator::kBootstrapNativeCall, NativeEntry::kNumArguments);

[zra, 2017/04/04 15:00:45]

ditto

 #endif
+    } else if (is_auto_scope()) {
+      // In the case of non bootstrap native methods the CallNativeCFunction
+      // stub generates the redirection address when running under the simulator
+      // and hence we do not change 'entry' here.
+      stub_entry = StubCode::CallAutoScopeNative_entry();
     } else {
       // In the case of non bootstrap native methods the CallNativeCFunction
       // stub generates the redirection address when running under the simulator
       // and hence we do not change 'entry' here.
-      stub_entry = StubCode::CallNativeCFunction_entry();
+      stub_entry = StubCode::CallNoScopeNative_entry();
     }
   }
   __ LoadImmediate(A1, argc_tag);
   ExternalLabel label(entry);
   __ LoadNativeEntry(T5, &label, kNotPatchable);
   if (link_lazily()) {
     compiler->GeneratePatchableCall(token_pos(), *stub_entry,
                                     RawPcDescriptors::kOther, locs());
   } else {
     compiler->GenerateCall(token_pos(), *stub_entry, RawPcDescriptors::kOther,
@@ skipping 4984 matching lines @@
   compiler->GenerateRuntimeCall(TokenPosition::kNoSource, deopt_id(),
                                 kGrowRegExpStackRuntimeEntry, 1, locs());
   __ lw(result, Address(SP, 1 * kWordSize));
   __ addiu(SP, SP, Immediate(2 * kWordSize));
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS