nir/opt_move_discards_to_top: use nir_tex_instr_has_implicit_derivative

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Fixes: 48158636bf ("nir: add is_gather_implicit_lod")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32145>

src/compiler/nir/nir_opt_move_discards_to_top.c

@@ -26,13 +26,6 @@
 #include "nir_control_flow.h"
 #include "nir_worklist.h"
 
-static bool
-nir_texop_implies_derivative(nir_texop op)
-{
-   return op == nir_texop_tex ||
-          op == nir_texop_txb ||
-          op == nir_texop_lod;
-}
 #define MOVE_INSTR_FLAG            1
 #define STOP_PROCESSING_INSTR_FLAG 2
 
@@ -149,7 +142,7 @@ opt_move_discards_to_top_impl(nir_function_impl *impl)
 
          case nir_instr_type_tex: {
             nir_tex_instr *tex = nir_instr_as_tex(instr);
-            if (nir_texop_implies_derivative(tex->op))
+            if (nir_tex_instr_has_implicit_derivative(tex))
                consider_discards = false;
             continue;
          }