backport llvm fix for issue 91671.

diff --git a/src/llvm-project b/src/llvm-project
index 221a195b62f4373a8893f4d022e4ce981b09a857..b6b46f596a7d2523ee1acd1c00e699615849da60 160000 (submodule)
--- a/src/llvm-project
+++ b/src/llvm-project
@@ -1 +1 @@
-Subproject commit 221a195b62f4373a8893f4d022e4ce981b09a857
+Subproject commit b6b46f596a7d2523ee1acd1c00e699615849da60