Integrate LLVM at llvm/llvm-project@4b4bc1ea16de

Updates LLVM usage to match
[4b4bc1ea16de](https://github.com/llvm/llvm-project/commit/4b4bc1ea16de)

PiperOrigin-RevId: 392863939
Change-Id: I57de1b74ff329e6189fa27a2a8cc669fec816d3c
diff --git a/third_party/llvm/workspace.bzl b/third_party/llvm/workspace.bzl
index f1121f3..1d922b4 100644
--- a/third_party/llvm/workspace.bzl
+++ b/third_party/llvm/workspace.bzl
@@ -4,8 +4,8 @@
 
 def repo(name):
     """Imports LLVM."""
-    LLVM_COMMIT = "fda176892e64b093996763465338863067e5b09e"
-    LLVM_SHA256 = "057516cdd53ebd5d68ae36e82e891d27243b925b824921f4dfe02381a952dcc9"
+    LLVM_COMMIT = "4b4bc1ea16dec58e828ec3a0154046b10ec69242"
+    LLVM_SHA256 = "a744dd2d7241daf6573ef88f9bd61b9d690cbac73d1f26381054d74e1f3505e0"
 
     tf_http_archive(
         name = name,