PATCH: R600/SI: Add ComplexPattern to match MUBUF variant with no VADDR

[Tom Stellard]

Hi,

The attached patches add a ComplexPattern that will enable a no-vaddr
variant of MUBUF instructions to be used for loads and stores with either
no offset, or an immediate offset that can be folded into the instruction.
This change will save use 2 VGPRs in these scenarios. 

-Tom
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