riscv64: add support for Zicond instructions

[lxq015]

Add support for the dissassembly of Zicond instructions and test cases.

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Patch Set 1:

(1 comment)

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Patch Set 1:

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[gopherbot]

Message from Mark Ryan:

Patch Set 7:

(2 comments)

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Message from Meng Zhuo:

Patch Set 7:

(1 comment)

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[gopherbot]

Message from Xueqi Luo:

Patch Set 8:

(2 comments)

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