radeonsi: don't do image stores with RGBX, L, LA, I, and SRGB formats

The only change in behavior is that RGBX stores now overwrite X, which is
what CB does and it's faster.

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17864>

src/gallium/drivers/radeonsi/si_compute_blit.c

@@ -511,6 +511,14 @@ static void si_launch_grid_internal_images(struct si_context *sctx,
           !(images[i].access & SI_IMAGE_ACCESS_DCC_OFF))
          images[i].access |= SI_IMAGE_ACCESS_ALLOW_DCC_STORE;
 
+      /* Simplify the format according to what image stores support. */
+      if (images[i].access & PIPE_IMAGE_ACCESS_WRITE) {
+         images[i].format = util_format_linear(images[i].format); /* SRGB not supported */
+         images[i].format = util_format_luminance_to_red(images[i].format);
+         images[i].format = util_format_intensity_to_red(images[i].format);
+         images[i].format = util_format_rgbx_to_rgba(images[i].format); /* prevent partial writes */
+      }
+
       /* Save the image. */
       util_copy_image_view(&saved_image[i], &sctx->images[PIPE_SHADER_COMPUTE].views[i]);
    }