st/mesa: fold GLThread.enabled into pin_thread_counter to skip that checking

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20287>

src/mesa/main/glthread.c

@@ -152,6 +152,9 @@ _mesa_glthread_init(struct gl_context *ctx)
 
    glthread->LastDListChangeBatchIndex = -1;
 
+   /* glthread takes over all L3 pinning */
+   ctx->st->pin_thread_counter = ST_L3_PINNING_DISABLED;
+
    /* Execute the thread initialization function in the thread. */
    struct util_queue_fence fence;
    util_queue_fence_init(&fence);

src/mesa/state_tracker/st_draw.c

@@ -91,8 +91,6 @@ prepare_draw(struct st_context *st, struct gl_context *ctx, uint64_t state_mask)
     * running on. The main thread can move between CCXs.
     */
    if (unlikely(st->pin_thread_counter != ST_L3_PINNING_DISABLED &&
-                /* no glthread */
-                !ctx->GLThread.enabled &&
                 /* do it occasionally */
                 ++st->pin_thread_counter % 512 == 0)) {
       st->pin_thread_counter = 0;