Fix regexp interrupt test.

test/cctest/test-regexp.cc

Index: test/cctest/test-regexp.cc
diff --git a/test/cctest/test-regexp.cc b/test/cctest/test-regexp.cc
index cc946464b26ab47c1aa78a0e9fe5d2e0837b3ea2..741acbc147700da7a598e9026524dc49c7ca59a3 100644
--- a/test/cctest/test-regexp.cc
+++ b/test/cctest/test-regexp.cc
@@ -1816,3 +1816,36 @@ TEST(Graph) {
   V8::Initialize(NULL);
   Execute("\\b\\w+\\b", false, true, true);
 }
+
+
+class TimeoutThread : public i::Thread {
+ public:
+  explicit TimeoutThread(v8::Isolate* isolate)
+      : Thread("TimeoutThread"), isolate_(isolate) {}
+
+  virtual void Run() {
+    OS::Sleep(500);  // Wait a bit before terminating thread.
+    v8::V8::TerminateExecution(isolate_);
+  }
+
+ private:
+  v8::Isolate* isolate_;
+};
+
+
+// Test that a regular expression execution can be interrupted and
+// survive a garbage collection.
+TEST(RegExpInterruption) {
+  v8::HandleScope scope(CcTest::isolate());
+  LocalContext env;
+
+  TimeoutThread timeout_thread(CcTest::isolate());
+  v8::TryCatch try_catch;
+
+  timeout_thread.Start();
+  // Run a regexp that does not terminate in reasonable time unless forced.
+  CompileRun("/((a*)*)*b/.exec('aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa')");
+  CHECK(try_catch.HasTerminated());
+
+  timeout_thread.Join();
+}