[lld] [lld][macho] Support order cstrings with -order_file_cstring (PR #140307)

[Ellis Hoag via llvm-commits]

https://github.com/ellishg commented:

I just realized that `CSTR:1234` is a valid symbol name (but so is `i386:blah`, so this format wasn't good in the first place). I don't know if `;` is an allowed character in a symbol, should we use that?

https://github.com/llvm/llvm-project/pull/140307