Add test case generator for runtime functions

test/mjsunit/runtime-gen/getthreaddetails.js

Index: test/mjsunit/runtime-gen/getthreaddetails.js
diff --git a/test/mjsunit/runtime-gen/getthreaddetails.js b/test/mjsunit/runtime-gen/getthreaddetails.js
new file mode 100644
index 0000000000000000000000000000000000000000..7712cdafb00484b5ebe51f02025bb044b3d1135e
--- /dev/null
+++ b/test/mjsunit/runtime-gen/getthreaddetails.js
@@ -0,0 +1,8 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// AUTO-GENERATED BY tools/generate-runtime-tests.py, DO NOT MODIFY
+// Flags: --allow-natives-syntax --harmony
+var _break_id = 32;
+var _index = 32;
+try {
+%GetThreadDetails(_break_id, _index);
+} catch(e) {}