Blackfin: Doloop optimization fix

[Bernd Schmidt]

This is a problem introduced by some earlier changes I made to generate
more hardware loops on the Blackfin.  In one case, with the following
structure:

  ...
  jump point_inside_loop;
head:
  do_stuff;
point_inside_loop:
  do_some_more_stuff;
  if condition jump head;

we would lose the initial jump into the loop; it was replaced by the
LSETUP instruction.

This patch fixes it.  If do_some_more_stuff is simple enough, we emit it
after the LSETUP, otherwise we use a jump to the point inside the loop.

Committed as 141548.


Bernd
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