freedreno/ir3: ir3_cmdline updates
1) convert to getopt, and drop most variant related options since they aren't super-useful these days.. and easy enough to add back if/when needed. (Also, none of the newer shader variant options where covered before.) 2) covert to dynamically allocated shader/variant, to get things working again after ir3_shader/_variant converted to ralloc 3) few small cleanups Signed-off-by:Rob Clark <robdclark@chromium.org> Part-of: <mesa/mesa!6189>