Provides -addresses, -a as aliases for -print-address. Motivation: https://bugs.llvm.org/show_bug.cgi?id=40067.
One thing I've noticed is that single-letter arguments can be combined in GNU addr2line (e.g. addr2line -aC means demangle and print addresses), but not llvm-symbolizer as things stand. I'll file a bug for it, as it's probably worth fixing this all in one go.
The fix can be done by using the cl::Grouping attribute, I believe.