[clang] [clang-tools-extra] [clang-tidy] New performance linter: performance-inefficient-copy-assign (PR #179467)

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serge-sans-paille wrote:

Thanks for the first set of reviews - I'll do that. I also have a generalization of the approach in mind, but Id' first like to have the minimal version ready.

https://github.com/llvm/llvm-project/pull/179467