[clang] [Clang][diagnostics] Fix structured binding shadows template param loc (PR #129116)

[Erich Keane via cfe-commits]

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@@ -214,6 +214,8 @@ Improvements to Clang's diagnostics
   :doc:`ThreadSafetyAnalysis` still does not perform alias analysis. The
   feature will be default-enabled with ``-Wthread-safety`` in a future release.
 
+- Improve the diagnostics for shadows template parameter.
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erichkeane wrote:

This should probably mention the bug# as well as slightly better clarify that it is giving a more correct location.

https://github.com/llvm/llvm-project/pull/129116