cse.c (delete_dead_from_cse): If a libcall produces a constant result and that result can be substituted into...

        * cse.c (delete_dead_from_cse): If a libcall produces a constant
        result and that result can be substituted into SET_SRC of the
        insn with the REG_RETVAL note, then perform the substitution
        and delete the libcall.

From-SVN: r17871