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

[via cfe-commits]

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+.. title:: clang-tidy - performance-redundant-lookup
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+performance-redundant-lookup
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+This check warns about potential redundant container lookup operations within
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EugeneZelenko wrote:

Please synchronize with statement in Release Notes.

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