RFR: 2198: Backport PRs should check if a CSR is required [v2]

[Zhao Song]

On Fri, 22 Mar 2024 14:24:59 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> I tried, but the code right now seems a bit complicated.
>
> I think it's fine. Maybe it would help with a comment on each method explaining what exactly it's constructing.

Sure, I will add some comments

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PR Review Comment: https://git.openjdk.org/skara/pull/1623#discussion_r1535816891