Blackfin: Fix dataflow breakage

[Bernd Schmidt]

Bernd Schmidt wrote:
> Someone had already done half a conversion on the Blackfin port, but
> clearly not compile tested it.
> 
> Rather than try and teach the df framework about SEQUENCE insns which we
> previously used to represent a bundle of three parallel instructions,
> I've decided to just leave them in the insn stream as is and rely on the
> fact that nothing runs after machine_reorg that could reorder them.  I
> needed to add a new function to remove var tracking notes from in
> between these insns, since the assembler chokes if it finds labels in
> the middle of an insn.

Here's a followup patch, committed as 125677.  With parallel insns no
longer represented as a SEQUENCE, the anomaly workaround code needs to
be taught to look at three consecutive insns as a unit in these cases.
Also, a bit of warning cleanup.


Bernd
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