dataflow-branch: new code committed.

[Kenneth Zadeck]

This fixes the last set of regressions from the first round of changes 
to the dataflow.

2005-11-01  Daniel Berlin  <dberlin@dberlin.org>
            Kenneth Zadeck <zadeck@naturalbridge.com>
    * flow.c (update_life_info): Added debugging.
    (init_propagate_block_info): Fixed typo.
    * df.c (df_refs_unlink, df_ref_record_1, df_ref_record,
    read_modify_subreg_p, df_def_record_1, df_insn_refs_record):
    Fixed control of when regs_ever_live is modified.
    * combine.c: Documentation rot.
    * reload1.c: Used wrong type of comment.

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