[jhc] darcs patch: jhc-prim changes (and 3 more)

Sun Jan 30 22:06:06 PST 2011 John Meacham * jhc-prim changes Sun Jan 30 22:15:57 PST 2011 John Meacham * don't treat promote or demote in tail call position as tail call safe Mon Jan 31 01:34:28 PST 2011 John Meacham * flip the order of dropped slots (TODO: needs regression test) Mon Jan 31 02:24:15 PST 2011 John Meacham * cleanups