[clang-tools-extra] [clang-tidy] Avoid repeated hash lookups (NFC) (PR #107490)

[Kazu Hirata via cfe-commits]

kazutakahirata wrote:

> Are you finding those automatically with a tool? Or just stumbled upon it?

Somewhat automatically.  Put `[[deprecated]]` on `insert` and `try_emplace`, collect warnings from the build, and look for `find` and `contain` in the few lines prior to `insert` and `try_emplace`.  I guess I could use `clang-query`, too.



https://github.com/llvm/llvm-project/pull/107490