Add intrinsics for the new AMX target features

[sayantn]

WIP

• Tests
• Links to Intrinsics Guide (not updated yet, probably will be after DiamondRapids is released). Temporarily patched stdarch-verify to make it work

This was sitting around for quite some time, I didn't open the PR because it's still not in the Intrinsics Guide

[sayantn]

@Amanieu should I go ahead and open this PR (with some modifications in the stdarch_verify logic to get around the fact that these aren't in the Intrinsics Guide yet)?

[Amanieu]

It's fine to add these, but please add a FIXME: since these aren't in the XML they are not being tested.

[sayantn]

Just to be clear, I will be adding the normal tests (I'm just being lazy), only thing that won't be tested is the presence of links to the Intel docs

[rustbot]

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[sayantn]

Finally got around to finishing this lol