Bump LLVM to https://github.com/llvm/llvm-project/pull/78329 (#16180)

diff --git a/third_party/llvm-project b/third_party/llvm-project
index 7ea6688..905caa5 160000
--- a/third_party/llvm-project
+++ b/third_party/llvm-project
@@ -1 +1 @@
-Subproject commit 7ea6688479cebb1c041eb2d4cbe673c6b593087e
+Subproject commit 905caa57a4bf51db81a414056df5fba47adf2b21