RFR: 8283737: riscv: MacroAssembler::stop() should emit fixed-length instruction sequence [v3]

[Xiaolin Zheng]

On Wed, 30 Mar 2022 07:15:55 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Looks fine. But I would rather push `c_beqz` change under a separate PR, so that the issue tracking is clean.

Thank you for the review and the quite reasonable suggestion, Aleksey. I have removed the unrelated part from this patch and the JBS issue and will put it into another patch. - 
If it looks okay for you, I would type one integrate then.

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PR: https://git.openjdk.java.net/jdk/pull/7982