* loop.c (invariant_p): Don't test flag_rerun_loop_opt.
        (loop_optimize, scan_loop, strength_reduce): New argument unroll_p.
        * toplev.c (rest_of_compilation): Pass it.  Remove code to
        save / clear / restore flag_unroll_{,all_}loops.

        * i386.c (notice_update_cc): Remove bogus pentium GCC code.

        * stmt.c (warn_if_unused_value): Don't warn for TRY_CATCH_EXPR.
Various pending patches.

From-SVN: r16973