* flow.c (find_basic_blocks): Remove do_cleanup argument.
        Break out that code ...
        (cleanup_cfg): ... here.
        (commit_one_edge_insertion): Detect a return instruction being
        emitted to an edge.  Emit a barrier following; clear fallthru.
        (commit_edge_insertions): Verify CFG consistency.
        * function.c (expand_function_start): Kill unused variable.
        (expand_function_end): Likewise.
        (thread_prologue_and_epilogue_insns): Use insert_insn_on_edge
        to insert the epilogue.

        * gcse.c (gcse_main): Adjust for find_basic_blocks change.
        (delete_null_pointer_checks): Likewise.
        * output.h: Likewise.
        * reg-stack.c (reg_to_stack): Likewise.
        * toplev.c (rest_of_compilation): Likewise.  Run
        thread_prologue_and_epilogue_insns after rebuilding the CFG.

From-SVN: r31676