New directory for test/bench type JavaScripts.

Sysops are not normally expected to run these.
- while1.js (infinite loop detection testing)
- recurse.js (infinite recursion detection testing)

exec/bench/recurse.js

+function me() { me(); }
+me();
\ No newline at end of file

exec/bench/while1.js

+while(1);
\ No newline at end of file