[clang-tools-extra] [clang-tidy] Add performance-redundant-lookup check (PR #125420)

[Balazs Benics via cfe-commits]

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@@ -91,6 +91,12 @@ Improvements to clang-tidy
 New checks
 ^^^^^^^^^^
 
+- New :doc:`performance-redundant-lookup
+  <clang-tidy/checks/performance/redundant-lookup>` check.
+
+  This check warns about potential redundant container lookup operations within
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steakhal wrote:

Dropped in c6a681c955fef8b933374a05a157f48ba4ead360

https://github.com/llvm/llvm-project/pull/125420