[Complier] Only optimize a function marked for tier-up if it is compiled.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index b8fbbcfa2c31dea9d7fc002d6dcc7389d096ee65..7e2eec90e44938e24a109742c76e49f156aaadb9 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -880,7 +880,8 @@ MaybeHandle<Code> GetLazyCode(Handle<JSFunction> function) {
     return cached_code;
   }
 
-  if (function->shared()->marked_for_tier_up()) {
+  if (function->shared()->is_compiled() &&
+      function->shared()->marked_for_tier_up()) {
     DCHECK(FLAG_mark_shared_functions_for_tier_up);
 
     function->shared()->set_marked_for_tier_up(false);