[ABANDONED] Call Microtask::performCheckpoint for each worker task.

Source/bindings/v8/ScriptRegexp.cpp

Index: Source/bindings/v8/ScriptRegexp.cpp
diff --git a/Source/bindings/v8/ScriptRegexp.cpp b/Source/bindings/v8/ScriptRegexp.cpp
index e8f3c5fe6bde47382caeafac20b87cdccf3469d5..8614ee2bb8feee02a7b958d1ade8ae1f498e02dc 100644
--- a/Source/bindings/v8/ScriptRegexp.cpp
+++ b/Source/bindings/v8/ScriptRegexp.cpp
@@ -39,7 +39,12 @@ ScriptRegexp::ScriptRegexp(const String& pattern, TextCaseSensitivity caseSensit
 {
     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     v8::HandleScope handleScope(isolate);
-    v8::Context::Scope contextScope(V8PerIsolateData::from(isolate)->ensureDomInJSContext());
+    v8::Local<v8::Context> context = V8PerIsolateData::from(isolate)->ensureDomInJSContext();
+    if (context.IsEmpty()) {
+        // The script execution is terminated.
+        return;
+    }
+    v8::Context::Scope contextScope(context);
     v8::TryCatch tryCatch;
 
     unsigned flags = v8::RegExp::kNone;