PATCH: R600/SI: Stop using VSrc_* as default register classes

[Tom Stellard]

Hi,

The series removes the remaining uses of VSrc* registers as
default register classes for types.  We now use SReg classes
for integer types and VReg classes for floating-point types.

This will simplify the FixSGPRCopies pass and it also eliminates
a number of unnecessary copies that were being used to copy
data to and from the VSrc classes.

-Tom
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