r600c: fix some opcodes on evergreen
r600c: fix some opcodes on evergreen

There were a few places where we were using the wrong opcodes
on evergreen.  arl still needs to be fixed on evergreen; see
r600g for reference.

NOTE: This is a candidate for the 7.9 branch.

Signed-off-by: Alex Deucher <bf84f557a1e54fd62cd73c6847f7d9df60e9fbef@gmail.com>

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