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

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 <amaasikas@gmail.com>
r600c: bump sq gpr resources if a shader needs more than default

Signed-off-by: Dave Airlie <airlied@redhat.com>