Auto create ApiLocalScope before calling native functions, this ensures that

runtime/vm/intermediate_language_arm.cc

Index: runtime/vm/intermediate_language_arm.cc
===================================================================
--- runtime/vm/intermediate_language_arm.cc	(revision 25778)
+++ runtime/vm/intermediate_language_arm.cc	(working copy)
@@ -1000,15 +1000,20 @@
   // this is a redirection address that forces the simulator to call
   // into the runtime system.
   uword entry = reinterpret_cast<uword>(native_c_function());
+  const ExternalLabel* stub_entry;
+  if (is_bootstrap_native()) {
+    stub_entry = &StubCode::CallBootstrapCFunctionLabel();
 #if defined(USING_SIMULATOR)
-  entry = Simulator::RedirectExternalReference(entry,
-                                               Simulator::kNativeCall,
-                                               function().NumParameters());
+    entry = Simulator::RedirectExternalReference(
+        entry, Simulator::kBootstrapNativeCall, function().NumParameters());
 #endif
+  } else {

[regis, 2013/08/06 17:01:22]

For clarity, I would add a comment explaining that the CallNativeCFunction stub
generates the redirection when running under the simulator.
Ditto on the MIPS side.

[siva, 2013/08/06 19:04:26]

Done.

+    stub_entry = &StubCode::CallNativeCFunctionLabel();
+  }
   __ LoadImmediate(R5, entry);
   __ LoadImmediate(R1, NativeArguments::ComputeArgcTag(function()));
   compiler->GenerateCall(token_pos(),
-                         &StubCode::CallNativeCFunctionLabel(),
+                         stub_entry,
                          PcDescriptors::kOther,
                          locs());
   __ Pop(result);