i965/disasm: "Handle" Gen8+ HF/DF immediate cases.
i965/disasm: "Handle" Gen8+ HF/DF immediate cases.

We should print something properly, but I'm not sure how to properly
print an HF, and we don't have any DFs today to test with.

This is at least better than the current Gen8 disassembler, which would
simply assert fail.

Signed-off-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Matt Turner <789b315743a28dd066a4ba1459c35951c291d8a6@gmail.com>

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