RFR: JDK-8289512: Fix GCC 12 warnings for adlc output_c.cpp [v2]

[Lutz Schmidt]

On Thu, 30 Jun 2022 15:21:36 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> This fixes three warnings in my gcc 12 build on Ubuntu 22.04.
>
> Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:
> 
>   assert sprint did not overflow

Changes look good to me.

Thank you for investing your time.

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Marked as reviewed by lucy (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9335