i370.c: Remove LONGEXTERNAL ifdef from alias_number.

i370.c: Remove LONGEXTERNAL ifdef from alias_number.

        * i370.c: Remove LONGEXTERNAL ifdef from alias_number. Added hash
        routine constants.
        (mvs_hash_alias): New function.
        (mvs_add_alias): Change argument spacing.
        (mvs_need_alias): Change aliasing criteria. Added documentation.
        (mvs_get_alias): Change to use hashed name. The hashed name prevents
        CSECT name collisions.
        (mvs_check_alias): Likewise.
        (handle_pragma): Change documentation.
        * i370.md (mulsi3, divsi3, udivsi3, modsi3, umodsi3): Changed gen_rtx
        mode from SImode to DImode.
        (iorhi3): Changed LTORG size for insn.

From-SVN: r35282