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

[Tyler Rockwood via cfe-commits]

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@@ -168,6 +168,19 @@ New checks
   extracted from an optional-like type and then used to create a new instance
   of the same optional-like type.
 
+- New :doc:`bugprone-unused-local-non-trivial-variable
+  <clang-tidy/checks/bugprone/unused-local-non-trivial-variable>` check.
+
+  Warns when a local non trivial variable is unused within a function. By
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rockwotj wrote:

Done.

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