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

[Baranov Victor via cfe-commits]

https://github.com/vbvictor commented:

I'm also in favour of a more general name if we are to improve this check in the future

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