AOT: Enable optimizing native functions. Removes some initialization of unused split slots.

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 2456ed6b1defb6ad7f97bc4650d3a575828b11ee..0a1c7a90eb127d9db154adb37fb6defaaaab60c9 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -5977,13 +5977,13 @@ void Function::SetNumOptionalParameters(intptr_t num_optional_parameters,
 
 
 bool Function::IsOptimizable() const {
+  if (FLAG_precompiled_mode) {
+    return true;
+  }
   if (is_native()) {
     // Native methods don't need to be optimized.
     return false;
   }
-  if (FLAG_precompiled_mode) {
-    return true;
-  }
   const intptr_t function_length = end_token_pos().Pos() - token_pos().Pos();
   if (is_optimizable() && (script() != Script::null()) &&
       (function_length < FLAG_huge_method_cutoff_in_tokens)) {