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Re: Init df for split pass since some target use REG_NOTE in split pattern

Hi Jeff:
> This seems better suited as a generic optimization than hidden away in a
> backend.
>
> AFAICT you're just noticing a word of the output operand is dead and eliding
> the load/store for that word.
>
> In fact, I'm a bit surprised nothing has optimized this away by the time
> reload/LRA is done.   You might spend some time walking through lower-subreg
> to see if it can be easily extended to handle your case.

Agree, I will take a look for lower-subreg and LRA.

However this patch still need for other target, this patch is ok for trunk?
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