[llvm] [llvm-cxxfilt] Added the option --no-params (PR #75348)

[James Henderson via llvm-commits]

jh7370 wrote:

I've not attempted to review your implementation yet, because the output doesn't match the expected output. The `--no-params` option doesn't just not demangle the parameters, it omits the enclosing parentheses entirely. I think this is important behaviour that we need to replicate. Otherwise, it could be easy to mistake a function demangled with this option with one with no parameters. In general, we aim to be compatible with the GNU binutils, and I believe there's no reason to deviate here.

https://github.com/llvm/llvm-project/pull/75348