[libcxx] [lldb] [flang] [clang] [libc] [llvm] [compiler-rt] [clang] Fix assertion failure with deleted overloaded unary operators (PR #78316)

[via llvm-commits]

https://github.com/cor3ntin approved this pull request.

LGTM (modulo nit)

https://github.com/llvm/llvm-project/pull/78316