* ld-elf/group1.d: Support 64bit.
bfd/ * elflink.c (elf_link_add_object_symbols): Make symbols from discarded sections undefined. ld/testsuite/ * ld-elf/group1.d: New test. * ld-elf/group.ld, ld-elf/group1a.s, ld-elf/group1b.s: New test.