[DO NOT COMMIT] IsExecutionTerminating test

test/cctest/test-thread-termination.cc

Index: test/cctest/test-thread-termination.cc
diff --git a/test/cctest/test-thread-termination.cc b/test/cctest/test-thread-termination.cc
index 523704ba69eb07ab432f6aab3f63eebe1a1798c5..0266684576762de1a7e7405d8aecc1ceb28f845a 100644
--- a/test/cctest/test-thread-termination.cc
+++ b/test/cctest/test-thread-termination.cc
@@ -201,6 +201,7 @@ TEST(TerminateOnlyV8ThreadFromOtherThread) {
       CompileRun(CcTest::isolate()->GetCurrentContext(),
                  "try { loop(); fail(); } catch(e) { fail(); }");
   CHECK(result.IsEmpty());
+  CHECK(CcTest::isolate()->IsExecutionTerminating());
   thread.Join();
   delete semaphore;
   semaphore = NULL;