Integrate LLVM at llvm/llvm-project@54f1d950667c

Updates LLVM usage to match
[54f1d950667c](https://github.com/llvm/llvm-project/commit/54f1d950667c)

PiperOrigin-RevId: 423792171
Change-Id: Ie8061c34baba48bf7e4997cb00ba67fa5c2c8eaa
diff --git a/third_party/llvm/workspace.bzl b/third_party/llvm/workspace.bzl
index 596a547..ab43529 100644
--- a/third_party/llvm/workspace.bzl
+++ b/third_party/llvm/workspace.bzl
@@ -4,8 +4,8 @@
 
 def repo(name):
     """Imports LLVM."""
-    LLVM_COMMIT = "7ccacaf4428d1712029594184baa6f617a51c340"
-    LLVM_SHA256 = "312ec01fc8aad123c06f1504ee719677ddd518c1a429bdda66f31e7193e262ec"
+    LLVM_COMMIT = "54f1d950667cac9d1cbf549c72972bcb487b6fa7"
+    LLVM_SHA256 = "8b6b2e3950e3dea374a2563985d929f67a81fc42bafdc970dd1deec8f2dc427b"
 
     tf_http_archive(
         name = name,