PATCHES: R600/SI: Fix for v_interp_p1 bug on chips with 16 LDS banks.

[Tom Stellard]

Hi,

The attached patches prevent v_interp_v1_f32 instructions from using
the same register for the src and dst operand on chips with 16 LDS
banks.  This should fix these bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=90439
https://bugs.freedesktop.org/show_bug.cgi?id=89034

-Tom
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