Add SQ_WAVE_TTMPx support for gfx9

[Nicolai Hähnle]

I don't think this is the right approach.

TTMPs are really just SGPRs. They're only special because access to them 
is restricted to trap handlers.

Note how the index ixSQ_WAVE_TTMP0 is 0x26c. 0x200 is the base for 
reading SGPRs, and 0x6c is the operand encoding of TTMP0.

I think umr should just use the SGPR read path with the correct index.

Thanks,
Nicolai

On 06.04.2018 16:51, Tom St Denis wrote:
> Patches attached for both umr/kernel.
> 
> Tested on my Raven1.  I'll circle back to adding gfx8 after lunch.
> 
> Tom
> 
> 
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