[dataflow]: PATCH COMMITTED to reuse regnote rather than deleting and recreating them.

[Kenneth Zadeck]

Kenneth Zadeck wrote:
> This patch tries to reuse regnotes rather than deleting them and
> recreating them.
>
> This patch has been bootstrapped and regression tested on x86-32 x86-64,
> ppc, and ia-64.
>
> 2007-05-01  Kenneth Zadeck <zadeck@naturalbridge.com>
>
>     Do not delete regnotes when recreating them.
>     * df-problems.c (df_kill_notes): Store notes into new parameters
>     rather than killing them.
>     (df_set_note): New function.
>     (df_set_unused_notes_for_mw, df_set_dead_notes_for_mw,
>     df_create_unused_note, df_ri_bb_compute): Call df_set_note to
>     create new notes.
>     
>
>   
enopatch, sorry.

kenny
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