r600g: adjust vs/ps gprs on r600/r700 cards when needed.

Ideally we'd have a compiler and register spilling and all that
but this is good enough for now to avoid the gpu hang in piglit,

glsl-vs-vec4-indexing-temp-dst-in-nested-loop-combined

on r600/r700 cards.

based on r600c patch
Andre Maasikas <[email protected]>
r600c: bump sq gpr resources if a shader needs more than default

Signed-off-by: Dave Airlie <[email protected]>

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