Move resolving of natives to a late stage (during code emission). That eliminates unnecessary nativ…

runtime/vm/intermediate_language_x64.cc

Index: runtime/vm/intermediate_language_x64.cc
diff --git a/runtime/vm/intermediate_language_x64.cc b/runtime/vm/intermediate_language_x64.cc
index cc1967501c1f76fd2e0159cacafc80d4ca2f7e80..3d30dc0a2e639f07f52c6257f1f226e9b2cf42af 100644
--- a/runtime/vm/intermediate_language_x64.cc
+++ b/runtime/vm/intermediate_language_x64.cc
@@ -772,10 +772,11 @@ LocationSummary* NativeCallInstr::MakeLocationSummary(Zone* zone,
 
 
 void NativeCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  SetupNative();
   Register result = locs()->out(0).reg();
   const intptr_t argc_tag = NativeArguments::ComputeArgcTag(function());
   const bool is_leaf_call =
-    (argc_tag & NativeArguments::AutoSetupScopeMask()) == 0;
+      (argc_tag & NativeArguments::AutoSetupScopeMask()) == 0;
 
   // Push the result place holder initialized to NULL.
   __ PushObject(Object::null_object());