RFR: 7903132: Replace casts with type test pattern [v3]

[Maurizio Cimadamore]

On Fri, 25 Mar 2022 19:59:41 GMT, Ethan McCue <duke at openjdk.java.net> wrote:

>> Replaces a handful of casts following type tests with the equivalent pattern syntax.
>> 
>> I cannot create a matching issue, as I do not have an account on the bug tracker.
>
> Ethan McCue has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Use patterns inline with && expression when possible for equals

Looks good

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Marked as reviewed by mcimadamore (Committer).

PR: https://git.openjdk.java.net/jextract/pull/5