Reland "Optimize function across closures." (again).

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 72974a317c18646800178b4c10340a85b444afcf..c500212b0a708c494ca10c35212458266f95fe2b 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -1358,6 +1358,14 @@ Handle<JSObject> Factory::NewFunctionPrototype(Handle<JSFunction> function) {
 }
 
 
+static bool ShouldOptimizeNewClosure(Isolate* isolate,
+                                     Handle<SharedFunctionInfo> info) {
+  return isolate->use_crankshaft() && !info->is_toplevel() &&
+         info->is_compiled() && info->allows_lazy_compilation() &&
+         !info->optimization_disabled() && !isolate->DebuggerHasBreakPoints();
+}
+
+
 Handle<JSFunction> Factory::NewFunctionFromSharedFunctionInfo(
     Handle<SharedFunctionInfo> info,
     Handle<Context> context,
@@ -1395,14 +1403,11 @@ Handle<JSFunction> Factory::NewFunctionFromSharedFunctionInfo(
     return result;
   }
 
-  if (isolate()->use_crankshaft() &&
-      FLAG_always_opt &&
-      result->is_compiled() &&
-      !info->is_toplevel() &&
-      info->allows_lazy_compilation() &&
-      !info->optimization_disabled() &&
-      !isolate()->DebuggerHasBreakPoints()) {
+  if (FLAG_always_opt && ShouldOptimizeNewClosure(isolate(), info)) {
     result->MarkForOptimization();
+  } else if (info->optimize_next_closure() &&
+             ShouldOptimizeNewClosure(isolate(), info)) {
+    result->AttemptConcurrentOptimization();
   }
   return result;
 }