e811cb00e5
This patch implements support for the UNROLL directive to control how many times a loop should be unrolled. It must be placed immediately before a `DO LOOP` and applies only to the loop that follows. N is an integer that specifying the unrolling factor. This is done by adding an attribute to the branch into the loop in LLVM to indicate that the loop should unrolled. The code pushed to support the directive `VECTOR ALWAYS` has been modified to take account of the fact that several directives can be used before a `DO LOOP`.
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