nir: fix nir_fixup_is_exported for LLVM-22

Starting with LLVM-22 we won't see the kernel wrapper anymore, and this
is a trivial fix to get around this.

See: 5458eb2511

Cc: mesa-stable
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39374>
(cherry picked from commit 24d20df3d6)

.pick_status.json

@@ -1794,7 +1794,7 @@
         "description": "nir: fix nir_fixup_is_exported for LLVM-22",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": null,
         "notes": null

src/compiler/nir/nir_fixup_is_exported.c

@@ -48,6 +48,15 @@ nir_fixup_is_exported(nir_shader *nir)
    nir_foreach_function(func, nir) {
       if (_mesa_set_search(shadowed, func->name)) {
          func->is_exported = func->is_entrypoint;
+      } else {
+         /* Starting with LLVM-22 we don't see the wrappers anymore, so we
+          * can simply export every entrypoint.
+          *
+          * We could do an LLVM version check here, but that's going to be a
+          * mess making nir depending on LLVM in any way and this seems to work
+          * for both situations.
+          */
+         func->is_exported |= func->is_entrypoint;
       }
 
       if (func->name[0] == '_') {