don't treat promote or demote in tail call position as tail call safe
don't treat promote or demote in tail call position as tail call safe

Ignore-this: d3f887d2f98df5c7e93bc2de335b5d36

darcs-hash:6369d155e558a5ee6fd208966f343f4d6880ac95

dpwright/jhc,dpwright/jhc,dpwright/jhc,dpwright/jhc