i965/compaction: Simplify jump target code.
i965/compaction: Simplify jump target code.

My attempts to clarify the code with _compacted/_uncompacted prefixed
variables apparently failed. Hopefully this is clearer.

In any case, the previous code wasn't clear enough to gcc to let it
optimize division by a power of two into a shift. No problems now.

Also, the previous code (in the ADD case) didn't work on 32-bit x86, due
to complicated set of interactions best summed up as unsigned division
and compiler optimizations.

Tested-by: Mark Janes <dc19c7a5044e1b627d35321fa5e1121fad8638f9@intel.com>

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