R600/SI: MIN3 and MAX3 for VI take 2

[Marek Olšák]

Hi,

Changes:
- FMIN3 and FMAX3 tests enabled for VI
- really basic global_store i32 support for VI to allow the tests to run

The MUBUF store implementation is pretty bad, but we don't need those
opcodes for anything except tests. I plan to add all MUBUF opcodes
properly in the future.

Marek
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