llvm-slicer: allow dump IR with annotations
llvm-slicer: allow dump IR with annotations

handy when debugging slicing of graphs that are too
big for dot to display

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

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