llvm PointerSubgraph.cpp: do not trap on uknown node
llvm PointerSubgraph.cpp: do not trap on uknown node

I forget there the trap call after debugging

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

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