Move a debug statement at the end of new_clues from the caller (just
after return) to the callee (just before). Might print something
useful in the soak-test context (where that debug statement will now
be printed and previously wasn't), but the main aim is to remove the
variable 'ngen' at the main call site, which triggered a set-but-not-
used warning if the debug statement that printed it was compiled out.

[originally from svn r9392]