* bitmap.h (BITMAP_XFREE): New.
        * flow.c (life_analysis): Use it.
        (life_analysis_1): Free blocks.

        * combine.c (undo_commit): New.
        (try_combine): Use it.  Don't zap undobuf.undos.
        (combine_instructions): Don't zap undobuf.undos; free the
        undobuf.frees list.

        * local-alloc.c (local_alloc): Free qty_phys_num_sugg.

        * stmt.c (cost_table_): New.
        (estimate_case_costs): Use it instead of xmalloc.

        * toplev.c (compile_file): Reuse dumpname memory instead
        of strdup'ing it.

From-SVN: r30404