Add -i for -inlining, -C for demangler and -e for -obj option.
FWIW, as far as I can tell binutils addr2line spells the long versions of these as --inlines, --demangle, --exe, and ELF Tool Chain addr2line does too (but does not support -i). Should we have those as aliases as well?
First of all, what is your use case?
I have a minor concern about adding these aliases: I'm not sure that merging command line options would work for LLVM tools. So, for instance, you won't be able to write llvm-symbolizer -Cfi as you can write addr2line -Cfi, so we will not have drop-in replacement anyway.
Also, please update the docs.