i965/fs: Add a couple more algebraic cases that help some ARB_fp patterns.
i965/fs: Add a couple more algebraic cases that help some ARB_fp patterns.

ARB_fp doesn't go through the GLSL optimizer, and these were things you see
frequently thanks to conditionals being lowered to SLT/SGE and MUL.

Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>

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