Join threads after stopping.

test/cctest/test-mark-compact.cc

Index: test/cctest/test-mark-compact.cc
diff --git a/test/cctest/test-mark-compact.cc b/test/cctest/test-mark-compact.cc
index a01c5dfae3aa40bce96ac62b0eb02b620479a0fc..cb5157f1e0d35b9ee72f89d203f38cff96acd6e1 100644
--- a/test/cctest/test-mark-compact.cc
+++ b/test/cctest/test-mark-compact.cc
@@ -566,4 +566,31 @@ TEST(BootUpMemoryUse) {
   }
 }
 
+
+intptr_t ShortLivingIsolate() {
+  v8::Isolate* isolate = v8::Isolate::New();
+  { v8::Isolate::Scope iscope(isolate);
+    v8::V8::Initialize();
+    v8::Locker l(isolate);
+
+    v8::HandleScope handle_scope;
+    v8::Local<v8::Context> context = v8::Context::New(isolate);
+    CHECK(!context.IsEmpty());
+    v8::Context::Scope context_scope(context);
+    v8::TryCatch try_catch;
+    CompileRun("Math.abs(2);");
+  }
+
+  isolate->Dispose();
+  return MemoryInUse();
+}
+
+
+TEST(RegressJoinThreadsOnIsolateDeinit) {
+  intptr_t first_size = ShortLivingIsolate();
+  for (int i = 0; i < 10; i++) {
+    CHECK_EQ(first_size, ShortLivingIsolate());
+  }
+}
+
 #endif  // __linux__ and !USE_SIMULATOR