[Mesa-dev] [bug 47201] r600g: fix abs() support on ALU 3-source-operands instructions

[Xavier B.]

Hi,

Since alu does not support abs() modifier on source operands,
spill and apply the modifiers to a temp register when needed.


fixes https://bugs.freedesktop.org/show_bug.cgi?id=47201

I got hit by this bug while testing and debugging a game using the st/nine.
And I made a tentative fix that works for me.
(caveat: I know nothing about mesa/gallium/graphic cards, but hey..)
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