[llvm] Remark Util introduce remark count (PR #66214)

[Visoiu Mistrih Francis via llvm-commits]

================
@@ -110,6 +110,80 @@ if `--use-debug-loc` is passed then the CSV will include the source path, line n
   Source,Function,Count
   path:line:column,foo,3
 
+.. _count_subcommand:
+
+count
+~~~~~
+
+..program:: llvm-remarkutil count
+
+USAGE: :program:`llvm-remarkutil` count [*options*] <input file>
+
+Summary
+^^^^^^^
+
+:program:`llvm-remarkutil count` counts `remakrs <https://llvm.org/docs/Remarks.html>` based on specified properties. 
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francisvm wrote:

```suggestion
:program:`llvm-remarkutil count` counts `remarks <https://llvm.org/docs/Remarks.html>` based on specified properties. 
```

https://github.com/llvm/llvm-project/pull/66214