RFR: 8304434: [AIX] Update minimum xlclang version [v2]

[Tyler Steele]

On Tue, 4 Apr 2023 01:49:09 GMT, Tyler Steele <tsteele at openjdk.org> wrote:

>> Minor changes to the build system to recognize and warn that an incompatible toolchain is detected.
>
> Tyler Steele has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Change min xlx FP level to 11

Thanks for the reviews :-)

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PR Comment: https://git.openjdk.org/jdk/pull/13086#issuecomment-1536897137