* config/tc-mep.h (DIFF_EXPR_OK): Do not define.

    * config/tc-mep.h (DIFF_EXPR_OK): Do not define.

        * gas/all/gas.exp: Expect forward test to fail for MeP.
        Expect relax test to fail for MeP.
        * gas/mep/relocs.d: Update expected disassembly.

        * lib/ld-lib.exp (check_gc_sections_available): Add MeP to list of
        targets which do not support garbage collection.
        * ld-srec/srec.exp (run_srec_test): Expect tests to fail for MeP.
        * ld-elf/group8a.d: Likewise.
        * ld-elf/group8b.d: Likewise.
        * ld-elf/group9a.d: Likewise.
        * ld-elf/group9b.d: Likewise.

        * binutils-all/objdump.W: Do not assume that high and low PC
        addresses will have been computed.