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base-plus-offset relocs to the linker. * config/tc-mmix.c: Tweak and fix typos in comments. (allocate_undefined_gregs_in_linker): New variable. (OPTION_LINKER_ALLOCATED_GREGS): New option macro. (md_longopts): Add --linker-allocated-gregs. (md_parse_option) <case 'x'>: Imply --linker-allocated-gregs. <case OPTION_LINKER_ALLOCATED_GREGS>: New. (md_show_usage): Update text for -x. Add text for --linker-allocated-gregs. (tc_gen_reloc): Derive default value for addend from val and baddsy. Use addsec and bfd_is_abs_section in more places. Don't emit error for BFD_RELOC_MMIX_BASE_PLUS_OFFSET without suitable GREG if allocate_undefined_gregs_in_linker. * doc/as.texinfo (Overview) <Target MMIX options>: Add --linker-allocated-gregs. * doc/c-mmix.texi (MMIX-Opts): Add blurb about --linker-allocated-gregs. Mention that it's implied by -x. (MMIX-Pseudos) <GREG>: Mention when and how a GREG can be omitted. (MMIX-mmixal): Clarify dated comparison and location of MMIXware. * config/tc-mmix.h (md_parse_name): Use ISUPPER, not isupper.