RFR: 8294087: RISC-V: RVC: Fix a potential alignment issue and add more alignment assertions for the patchable calls/nops [v4]

[Xiaolin Zheng]

On Wed, 21 Sep 2022 14:16:47 GMT, Fei Yang <fyang at openjdk.org> wrote:

> I think this comment should be: "// Must be 4 bytes aligned"

Oh thanks for catching that. With hindsight, I found Aleksey had already hinted at it by indicating `...everywhere we say "Must be 4 bytes aligned"...`, but I failed to catch that :-) Thank you both!

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PR: https://git.openjdk.org/jdk/pull/10370