Run Crankshaft on a separate thread.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index cb87c71fb1193c38953701a88ffac4e1f465d9cd..88a485e999a817b48d820e451eb1f4d635f04cb6 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -7314,6 +7314,14 @@ void JSFunction::MarkForLazyRecompilation() {
 }
 
 
+void JSFunction::RecompileInParallel() {
+  ASSERT(FLAG_optimize_in_parallel);
+  i::Handle<JSFunction> handle(reinterpret_cast<JSFunction **>(
+      GetIsolate()->global_handles()->Create(this).location()));
+  GetIsolate()->queue_for_optimization(handle);
+}
+
+
 bool SharedFunctionInfo::EnsureCompiled(Handle<SharedFunctionInfo> shared,
                                         ClearExceptionFlag flag) {
   return shared->is_compiled() || CompileLazy(shared, flag);