* module/language/cps/rotate-loops.scm (rotate-loops-in-function): Don't
attempt to rotate a loop whose header is a $prompt. Fixes use of
`continue' in `while'. Thanks to Nala Ginrut for the report :)
* module/language/cps/rotate-loops.scm (rotate-loop): Instead of
restricting rotation to loops with just one exit node, restrict to
loops with just one exit successor.
