Bump LLVM into 21.1.1.

pz9115 · cmuellner · commit 6f560d909741 · 2025-09-15T10:30:37.000+02:00
diff --git a/llvm b/llvm
@@ -1 +1 @@
-Subproject commit 87f0227cb60147a26a1eeb4fb06e3b505e9c7261
+Subproject commit 5a86dc996c26299de63effc927075dcbfb924167
