llvm-dg-dump: print def and ptr info only when demanded
llvm-dg-dump: print def and ptr info only when demanded

It takes a lot of place

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

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