iris: Add an iris_write_reg macro

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <!9537>
35 jobs for !9537 with wip/anv-emit-reg-wr in 11 minutes and 22 seconds (queued for 3 seconds)
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sanity

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arm_test-base

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android_build

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aarch64
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ppc64el_build

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meson-android

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kvm
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