Integrate LLVM at llvm/llvm-project@494e77138c2e

Updates LLVM usage to match
[494e77138c2e](https://github.com/llvm/llvm-project/commit/494e77138c2e)

PiperOrigin-RevId: 370574378
Change-Id: Ib6f531a0e63733378d473c4b31e4b0ea8c229291
diff --git a/third_party/llvm/workspace.bzl b/third_party/llvm/workspace.bzl
index 23ddbfe..7a7a809 100644
--- a/third_party/llvm/workspace.bzl
+++ b/third_party/llvm/workspace.bzl
@@ -4,8 +4,8 @@
 
 def repo(name):
     """Imports LLVM."""
-    LLVM_COMMIT = "535df472b04208d6ae88e017c8f1d831fb239346"
-    LLVM_SHA256 = "3df8652412f4801eb5ab63705092526fb55e8d4a1fe016c4269ab39436e94da5"
+    LLVM_COMMIT = "494e77138c2e53961c43fe6957142d4f90034f98"
+    LLVM_SHA256 = "a1fb353141d25de395741ae8a5b8481a321dff6d17070dff72d286b8e901041a"
 
     tf_http_archive(
         name = name,