[lld] [ELF] Add --compress-nonalloc-section (PR #84855)

[Igor Kudrin via llvm-commits]

igorkudrin wrote:

> > It seems a bit inconsistent to me that, say, `--compress-nonalloc-sections '*bug*=zstd'` can be overridden by `--compress-debug-sections=zlib`, but not by `--compress-debug-sections=none`.
> 
> `=none` can override a previous `=zlib` or `=zstd`. `ld.lld -pie %t.o -o %t --compress-nonalloc-sections '*0=zlib' --compress-nonalloc-sections '*0=none'` in `lld/test/ELF/compress-nonalloc-sections.s` is such an example.

And still, if the name template in the `--compress-nonalloc-sections` matches debug sections, you cannot use just `--compress-debug-sections=none` to switch compressing debug sections off. Yes, there are possible workarounds to do that, but the most straightforward variant doesn't work.

https://github.com/llvm/llvm-project/pull/84855