2007-04-04  Chen Liqin  <liqin@sunnorth.com.cn>

        * config/score/crti.asm: Change _bss_start to __bss_start.
        * config/score/score.h (CONDITIONAL_REGISTER_USAGE): Added.
        (OUTGOING_REG_PARM_STACK_SPACE) update.
        * config/score/score.opt: add options to make backend support
        score5, score5u, score7 and score7d.
        * config/score/score.md: Likewise.
        * config/score/misc.md: Likewise.
        * config/score/mac.md: Likewise.
        * doc/invoke.texi: Likewise.
        * doc/md.texi: update constraints define.

From-SVN: r123490