When a = -1.0, pack_half_2x16(vec2(0x0000, 0xBC00)) will produce
0xBC000000. The ishr will produce 0xFFFFBC00. The replacement
pack_half_2x16(vec2(0xBC00, 0x0000)) will produce 0x0000BC00.
Fixes: 1f72857739b ("nir/algebraic: add some half packing optimizations") Reviewed-by: Rhys Perry <pendingchaos02@gmail.com> Reviewed-by: Matt Turner <mattst88@gmail.com> Cc: Connor Abbott <cwabbott0@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4515>