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zink: use hw int64

Erik Faye-Lund requested to merge kusma/mesa:zink-hw-int64 into master

When doubles and int64 was implemented in !7654 (merged), int64 was always lowered away as well.

Let's do better, and keep the int64 instructions around as long as we have support for it. Luckily, most instructions are size-agnostic, and already work fine, so there's just a few to add.

But a few of these instructions were actually required already from the get-go, but not implemented. So let's add them in a separate commit and mark that for back-porting.

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