Integrate LLVM at llvm/llvm-project@741ba8209c1f

Updates LLVM usage to match
[741ba8209c1f](llvm/llvm-project@741ba8209c1f)

PiperOrigin-RevId: 832480441

Author: HEIR Team

bazel/import_llvm.bzl

@@ -7,7 +7,7 @@ load(
 
 def import_llvm(name):
     """Imports LLVM."""
-    LLVM_COMMIT = "9625cf6cc0e3e530ea0bed971d85b363f77c49d8"
+    LLVM_COMMIT = "741ba8209c1f9bd5b1a145d9c137f5e18bfffb84"
 
     new_git_repository(
         name = name,