[clang-tools-extra] [clang-tidy] introduce a must use check (PR #76101)

[via cfe-commits]

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@@ -187,6 +187,13 @@ New checks
   points in a coroutine. Such hostile types include scoped-lockable types and
   types belonging to a configurable denylist.
 
+- New :doc:`misc-must-use
+  <clang-tidy/checks/misc/must-use>` check.
+
+  Add the ability to strictly enforce variables are used for specific classes,
+  even with they would not be normally warned using -Wunused-variable due 
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EugeneZelenko wrote:

Please highlight `-Wunused-variable` with single back-ticks.

https://github.com/llvm/llvm-project/pull/76101