Blackfin: Fix an ICE with doloop optimizations

[Bernd Schmidt]

This came up as an ICE in our gcc-4.3 based tree.  In some situations,
the hardware loop code creates a new basic block to hold the LSETUP
instruction.  We weren't creating an edge from that basic block to the
loop entry point, which could confuse subsequent passes (in this bug we
got an ICE during var-tracking).


Bernd
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