cfglayout.c (scope_to_insns_initialize): Call set_block_levels.

        * cfglayout.c (scope_to_insns_initialize): Call set_block_levels.
        (scope_to_insns_finalize): Do not call set_block_levels; handle
        sequences.
        (choose_inner_scope): New.
        * rtl.h (choose_inner_scope): Declare.

From-SVN: r54868