Fix display of files processed by the linker.

This fixes the way archive members are displayed when the linker is used with a
flag to show all the files that it processes.

When an archive file member is read, we need to show the archive filename and
the member.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@220144 91177308-0d34-0410-b5e6-96231b3b80d8