radeonsi: call ac_init_llvm_once before any util_queue initialization

The winsys uses util_queue, which calls atexit, so do it before the winsys
is created.

Cc: stable

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21041>
(cherry picked from commit 60a3f0667f)

.pick_status.json

@@ -52314,7 +52314,7 @@
         "description": "radeonsi: call ac_init_llvm_once before any util_queue initialization",
         "nominated": false,
         "nomination_type": 3,
-        "resolution": 4,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": null,
         "notes": null

src/gallium/drivers/radeonsi/si_pipe.c

@@ -148,8 +148,6 @@ bool si_init_compiler(struct si_screen *sscreen, struct ac_llvm_compiler *compil
       (sscreen->debug_flags & DBG(CHECK_IR) ? AC_TM_CHECK_IR : 0) |
       (create_low_opt_compiler ? AC_TM_CREATE_LOW_OPT : 0);
 
-   ac_init_llvm_once();
-
    if (!ac_init_llvm_compiler(compiler, sscreen->info.family, tm_options))
       return false;
 
@@ -1495,6 +1493,14 @@ struct pipe_screen *radeonsi_screen_create(int fd, const struct pipe_screen_conf
    if (!version)
      return NULL;
 
+   /* LLVM must be initialized before util_queue because both u_queue and LLVM call atexit,
+    * and LLVM must call it first because its atexit handler executes C++ destructors,
+    * which must be done after our compiler threads using LLVM in u_queue are finished
+    * by their atexit handler. Since atexit handlers are called in the reverse order,
+    * LLVM must be initialized first, followed by u_queue.
+    */
+   ac_init_llvm_once();
+
    driParseConfigFiles(config->options, config->options_info, 0, "radeonsi",
                        NULL, NULL, NULL, 0, NULL, 0);