data-flow: do not go over parameters
data-flow: do not go over parameters

we'll handle parameters from call-sites or function entries,
we don't want to call callbacks for parameter nodes

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

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