i965/disasm: Disassemble the compaction control bit.

i965/disasm: Disassemble the compaction control bit.

brw_disasm doesn't disassemble compacted instructions, so we uncompact
before disassembling them which would unset the compaction control bit.
Instead pass it as a separate argument.

Acked-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>