Integrate LLVM at llvm/llvm-project@af20aff35ec3

Updates LLVM usage to match
[af20aff35ec3](llvm/llvm-project@af20aff35ec3)

PiperOrigin-RevId: 706616434

Author: tensorflower-gardener

third_party/llvm/workspace.bzl

@@ -4,8 +4,8 @@ load("//third_party:repo.bzl", "tf_http_archive")
 
 def repo(name):
     """Imports LLVM."""
-    LLVM_COMMIT = "a21f9bfe29c2b9f1967952d12a5b7cb8f8b75202"
-    LLVM_SHA256 = "7039c2826841e473fe6431e36a2d8ba3746f200da53c481384f7f5d970e5bca1"
+    LLVM_COMMIT = "af20aff35ec37ead88903bc3e44f6a81c5c9ca4e"
+    LLVM_SHA256 = "6e31682011d8c483c6a41adf5389eb09ad7db84331ca985d33a5d59efd0388f6"
 
     tf_http_archive(
         name = name,