cpu: add support for amx detection

[anton-kuklin]

Added detection for x86 AMX,
including AMX-Tile, AMX-INT8 and AMX-BF16
instruction sets.

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[gopherbot]

This PR (HEAD: a243dce) has been imported to Gerrit for code review.

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[gopherbot]

Message from Tobias Klauser:

Patch Set 2:

(1 comment)

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Message from Anton Kuklin:

Patch Set 3:

(1 comment)

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This PR (HEAD: 7986ed6) has been imported to Gerrit for code review.

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[gopherbot]

Message from Tobias Klauser:

Patch Set 3:

(1 comment)

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Message from Anton Kuklin:

Patch Set 4:

(1 comment)

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Message from Tobias Klauser:

Patch Set 4: Auto-Submit+1 Code-Review+2 Run-TryBot+1

(1 comment)

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Message from Gopher Robot:

Patch Set 4:

(1 comment)

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Message from Gopher Robot:

Patch Set 4: TryBot-Result+1

(1 comment)

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Message from Michael Knyszek:

Patch Set 4: Code-Review+1

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[gopherbot]

This PR is being closed because golang.org/cl/516815 has been merged.