R600/SI: Prettier display of input modifiers and fold of fabs

[Vincent Lejeune]

Hi,

I reworked an old patch that improved the dump of SI input modifiers.
Previous patch was adding 6 input modifiers which made instruction manipulation quite difficult.

This new patch is only adding three (one modifier per inputs). Besides, I also worked on fabs folding (which may solve an issue raised lately because of fneg 0.0 issue).

Both were tested on hd 7750 with a week old piglit and there was no regression.

Vincent
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