i965: Add support for instruction compaction.
This reduces program size by using some smaller encodings for common bit patterns in the Gen ISA, with the hope of making programs fit in the instruction cache better. v2: Use larger bitshifts for the uncompressed field setups, in line with the way it's described in the spec. Consistently name a brw_compile "p" like all other code. Add a couple more tests. Consistently call things "compacted" not "compressed" (which is a different feature). Drop the explicit check for not compacting SENDs, which is unjustified and already implied by our lack of support for immediate values. Reviewed-by: Paul Berry <firstname.lastname@example.org>
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