Do not embed is_auto_setup_scope into the compilation of native calls.

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 799e76b9bd813703bbc5eae0d170775dc426e3c2..3eca45aabd6929eadf2dfcb18d73aa7fee15d542 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -6090,11 +6090,6 @@ bool Function::IsOptimizable() const {
 }
 
 
-bool Function::IsNativeAutoSetupScope() const {
-  return is_native() ? is_optimizable() : false;
-}
-
-
 void Function::SetIsOptimizable(bool value) const {
   ASSERT(!is_native());
   set_is_optimizable(value);
@@ -6105,12 +6100,6 @@ void Function::SetIsOptimizable(bool value) const {
 }
 
 
-void Function::SetIsNativeAutoSetupScope(bool value) const {
-  ASSERT(is_native());
-  set_is_optimizable(value);
-}
-
-
 bool Function::CanBeInlined() const {
   Thread* thread = Thread::Current();
   return is_inlinable() && !is_external() && !is_generated_body() &&