[PATCH] R600/SI: Fix various operand legalization bugs

[Matt Arsenault]

Hi,

This set of patches works towards removing SIISelLowering::legalizeOperands in favor of a post-isel hook which uses SIInstrInfo::legalizeOperands, which requires most of the same logic anyway. As in intermediate step, keep most of the original code in place for immediate folding where it is. This also fixes the overly strict enforcement of the 1 SGPR use constraint, which has been preventing f64 fdiv from working correctly. 

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