[lld-macho] Print archive names in linker map

If a symbol is pulled in from an archive, we should include the archive
name in the map file output. This is what ld64 does.

Note that we aren't using `toString(InputFile*)` here because it
includes the install name for dylibs in its output, and ld64's map file
does not contain those.

Reviewed By: #lld-macho, smeenai

Differential Revision: https://reviews.llvm.org/D145623