st/mesa: use new float comparison opcodes if native integers are supported
st/mesa: use new float comparison opcodes if native integers are supported

Should get rid of some float-to-int conversions (with negation).
No piglit regressions (with llvmpipe).

v2: fix bogus formatting spotted by Brian.

Reviewed-by: Brian Paul <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@vmware.com>

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