points-to: fix initializing global points-to
points-to: fix initializing global points-to

we need to use getGlobalNode() instead of getNode()
because with the later we get parameter global which
has not points-to set in this phase

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

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