RFR: 8283737: riscv: MacroAssembler::stop() should emit fixed-length instruction sequence [v4]

[Xiaolin Zheng]

On Wed, 30 Mar 2022 08:58:13 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Yes, looks good. Submit another PR for that change, and I'll approve too.

Thank you for the reviews Team! @RealFYang @shipilev

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