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

[Oliver Stöneberg via cfe-commits]

firewave wrote:

There appears to be an unaddressed false positive in your already merged changes: https://github.com/llvm/llvm-project/pull/178167#discussion_r2731996848

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