i965: Ask the register allocator to round-robin through registers.

The way we were allocating registers before, packing into low register
numbers for Ironlake, resulted in an overly-constrained dependency graph
for instruction scheduling.  Improves GLBenchmark 2.1 performance by
4.5% +/- 0.7% (n=26).  No difference on my old GLSL demo (n=20).  No
difference on nexuiz (n=15).

v2: Fix off-by-one bug that made the change only work for 16-wide on i965.
Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

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