nvc0/ir: add support for new bitfield manipulation opcodes

This adds support for:

IBFE, UBFE, BFI, LSB, IMSB, UMSB, BREV, POPC

Which are all required for ARB_gs5 support.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
nvc0/ir: add support for MUL_HI tgsi opcodes

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>