freedreno/ir3: split float/int abs/neg

freedreno/ir3: split float/int abs/neg

Even though in the end, they map to the same bits, the backend will need
to be able to differentiate float abs/neg vs integer abs/neg.  Rather
than making the backend figure it out based on instruction opcode (which
when combined with mov/absneg instructions, can be awkward), just split
out different flags for each so the frontend can signal it's intentions
more clearly.  Also, since (neg) for bitwise op's is actually a bitwise-
not, split it out into bnot flag.

Signed-off-by: Rob Clark <robclark@freedesktop.org>