[clang-tools-extra] [clang-tidy] Improve performance-use-std-move in presence of control-flow (PR #184136)

[via cfe-commits]

serge-sans-paille wrote:

+ Fix bug in previous implementation in presence of private move assign operator.
Tested successfully on Firefox, llvm, clang, clang-tools-extra and lld

https://github.com/llvm/llvm-project/pull/184136