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

[Yanzuo Liu via cfe-commits]

https://github.com/zwuis commented:

If we want to extend this check to detect more cases in future like initializing variables/parameters, I prefer more generic names like "performance-use-std-move".

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