intel/fs: Don't handle texop_tex for shaders without implicit LOD

These will be lowered by nir_lower_tex() with the
lower_tex_when_implicit_lod_not_supported, so don't need the extra
handling here.

Reviewed-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/intel/compiler/brw_nir.c

@@ -693,6 +693,7 @@ brw_preprocess_nir(const struct brw_compiler *compiler, nir_shader *nir,
       .lower_txp = ~0,
       .lower_txf_offset = true,
       .lower_rect_offset = true,
+      .lower_tex_without_implicit_lod = true,
       .lower_txd_cube_map = true,
       .lower_txb_shadow_clamp = true,
       .lower_txd_shadow_clamp = true,