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mesa/st: lower 64 bit ops to scalar before lowering to soft-float

Gert Wollny requested to merge gerddie/mesa:mesa-st-sclarize-64bit-ops into master

The fp64 emulation is not prepared for vectorized 64 bit code, so if the driver doesn't ask for lowering to scalar by itself, do it before lowering to soft-fb, and run a vectorization pass afterwards.

This is needed to support lowering soft-fp in r600.

@airlied @jekstrand

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