Run Crankshaft on a separate thread.

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 6bb7893746d794b7654e1fb7dfd85aaf8f9fe569..3ba1819729b433d8185a7394904475dbd2ae5320 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -568,7 +568,11 @@ Handle<JSFunction> Factory::NewFunctionFromSharedFunctionInfo(
       !function_info->is_toplevel() &&
       function_info->allows_lazy_compilation() &&
       !function_info->optimization_disabled()) {
-    result->MarkForLazyRecompilation();
+    if (FLAG_optimize_in_parallel) {
+      result->RecompileInParallel();
+    } else {
+      result->MarkForLazyRecompilation();
+    }
   }
   return result;
 }
@@ -1446,4 +1450,10 @@ Handle<Object> Factory::ToBoolean(bool value) {
 }
 
 
+void Factory::CompileJSFunction(Handle<JSFunction> function) {
+  CALL_HEAP_FUNCTION_VOID(isolate(),
+                          Runtime::CompileJSFunction(isolate(), function));
+}
+
+
 } }  // namespace v8::internal