Blackfin patch [1/2]: Parallel instructions

[Bernd Schmidt]

The Blackfin has the capability to execute up to three instructions in
parallel.  The assembler notation for this is
  A || B || C;
where A must be part of a class of instructions that assemble to a
32-bit instruction word, while B and C must be load or store operations
that assemble to a 16-bit instruction, for a 64-bit bundle in total.
There are a couple of additional restrictions on valid combinations.

This patch adds scheduling support for this; the compiler will now
generate instructions in the right order but emit them as
  A;
  B;
  C;
i.e., not as a parallel instruction bundle.  That will be fixed by the
next patch.

Committed as 119090.


Bernd
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