[llvm] [UTC] Support to test annotated IR (PR #165419)

[Nikita Popov via llvm-commits]

================
@@ -362,6 +364,12 @@ def main():
         choices=["none", "smart", "all"],
         help="Check global entries (global variables, metadata, attribute sets, ...) for functions",
     )
+    parser.add_argument(
+        "--check-inst_comments",
----------------
nikic wrote:

```suggestion
        "--check-inst-comments",
```

https://github.com/llvm/llvm-project/pull/165419