Decide ParseLazy vs ParseProgram based on is_toplevel

BUG=v8:5501

Review-Url: https://codereview.chromium.org/2410413003
Cr-Commit-Position: refs/heads/master@{#40231}

src/parsing/parser.cc

@@ -3824,11 +3824,11 @@ bool Parser::Parse(ParseInfo* info) {
   Isolate* isolate = info->isolate();
   pre_parse_timer_ = isolate->counters()->pre_parse();
 
-  if (!info->shared_info().is_null() && info->shared_info()->is_function()) {
-    result = ParseLazy(isolate, info);
-  } else {
+  if (info->is_toplevel()) {
     SetCachedData(info);
     result = ParseProgram(isolate, info);
+  } else {
+    result = ParseLazy(isolate, info);
   }
   info->set_literal(result);