nvc0/ir: fix emission of SHLADD with NEG modifiers
This affects GF100:GK110 chipsets, but not GM107+ where the
logic is a bit different. The emitters tried to emit sub
instead of subr when src0 has a NEG modifier.
This fixes the following piglit tests glsl-fs-loop-nested
and glsl-vs-loop-nested.
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Acked-by: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: "13.0" <mesa-stable@lists.freedesktop.org>
(cherry picked from commit
1ec7227d44dceae8de7b93f846bbd33d66007909)