llvm-ps-dump: use reference in for-range cycle
llvm-ps-dump: use reference in for-range cycle

do not copy the std::pair from maps

Signed-off-by: Marek Chalupa <b10e113ac36de0a194e1c1a71340ff6b6b99ebfb@mail.muni.cz>

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