llvm-slicer: use llvm's command line library
llvm-slicer: use llvm's command line library

do not parse command line itself. It has one disadvantege:
we had to change -debug option to -annotate option.
Otherwise all is the same.

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

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