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

[via cfe-commits]

Febbe wrote:

My old code and the name of the check can be reused btw., I just don't know anymore, why I lost interest / what was wrong with my idea, that I stopped working on it.

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