update submodules
diff --git a/llvm b/llvm
index 17406f3..2a6f354 160000
--- a/llvm
+++ b/llvm
@@ -1 +1 @@
-Subproject commit 17406f3a2a4c897901acaf4d521f4881d94443f8
+Subproject commit 2a6f354a56e749ac617324def6bc3dfa1129c28c