RFR: JDK-8329257: AIX: Switch HOTSPOT_TOOLCHAIN_TYPE from xlc to gcc [v3]

[Kim Barrett]

On Tue, 2 Apr 2024 11:35:44 GMT, Joachim Kern <jkern at openjdk.org> wrote:

>> linux macos and now Aix use this file.
>
> Who is able to explain if 
> `#if defined(LINUX) || defined(_ALLBSD_SOURCE) || defined(_AIX)`
>  in this file is equivalent to
> `#if 1`

See my other comments and https://bugs.openjdk.org/browse/JDK-8329546

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PR Review Comment: https://git.openjdk.org/jdk/pull/18536#discussion_r1548550923