RFR: JDK-8329257: AIX: Switch HOTSPOT_TOOLCHAIN_TYPE from xlc to gcc [v7]

[Martin Doerr]

On Tue, 9 Apr 2024 17:25:04 GMT, Stewart X Addison <duke at openjdk.org> wrote:

>> Pinging @sxa - what build environment does temurin use for AIX?
>
> Currently XLC16 but looking to upgrade to XLC17 on the minimum supported level for it (So it wouldn't be SP7 at present). Thanks for the ping - we have no current plans to increase to SP7.

Seems like we need to keep it. This is unfortunate. I wouldn't risk mixing malloc and vec_malloc. Who knows what kind of problems this could cause?
What happens if we try to build this code on AIX 7.2 TL5 SP7? Will the compiler complain because `malloc` is no longer defined? Should we check `defined(malloc)` in addition?

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PR Review Comment: https://git.openjdk.org/jdk/pull/18536#discussion_r1559425371