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

[Fei Yang]

On Wed, 21 Sep 2022 12:36:48 GMT, Xiaolin Zheng <xlinzheng at openjdk.org> wrote:

>> Sorry, I misread the patch, and confused `align` and `assert_alignment`.
>
>> Sorry, I misread the patch, and confused `align` and `assert_alignment`.
> 
> That's nothing. Thanks!

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

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