fix slicing away call-sites
fix slicing away call-sites

If we kept a function, we did not necessarily kept
the call-sites of the function. This is unsound.
Now we keep all the call-sites, which is sound
but unprecise - but we need the correctess atm,
later we can make it more precise.

Signed-off-by: Marek Chalupa <a05df156a69ad59faa9af9b666ef78009594c145@gmail.com>

mchalupa/dg,mchalupa/dg,mchalupa/dg,mchalupa/dg