Run Crankshaft on a separate thread.

test/cctest/test-threads.cc

Index: test/cctest/test-threads.cc
diff --git a/test/cctest/test-threads.cc b/test/cctest/test-threads.cc
index 713d1e842509f919781322e0b09cf8c8e727ecac..5fcecc64228b57279e204b5947f1badc3b0e6ff4 100644
--- a/test/cctest/test-threads.cc
+++ b/test/cctest/test-threads.cc
@@ -126,14 +126,18 @@ class ThreadB : public v8::internal::Thread {
 TEST(JSFunctionResultCachesInTwoThreads) {
   v8::V8::Initialize();
 
-  ThreadA threadA;
-  ThreadB threadB;
+  {
+    v8::Unlocker unlock;
 
-  threadA.Start();
-  threadB.Start();
+    ThreadA threadA;
+    ThreadB threadB;
 
-  threadA.Join();
-  threadB.Join();
+    threadA.Start();
+    threadB.Start();
+
+    threadA.Join();
+    threadB.Join();
+  }
 
   CHECK_EQ(DONE, turn);
 }