riscv64: add disassembly support and tests for CMO extensions

[newborn22]

Add disassembly support and tests for CMO extensions (Zicbom, Zicboz, Zicbop).

[gopherbot]

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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[gopherbot]

Message from Weihong Qiu:

Patch Set 1:

(1 comment)

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[gopherbot]

Message from Mark Ryan:

Patch Set 1:

(4 comments)

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[gopherbot]

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[gopherbot]

Message from Weihong Qiu:

Patch Set 3:

(4 comments)

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[gopherbot]

This PR (HEAD: d8ad40a) has been imported to Gerrit for code review.

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