RFR: JDK-8300783: Consolidate byteswap implementations [v13]

[Justin King]

On Tue, 7 Feb 2023 07:36:12 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> > Poke.
> 
> Working on it...

Oh, no problem! Ignore my impatience.

> > I am not 100% sure of XLC, it should generate a single store instruction. Getting a copy of the old XLC on AIX (not the clang-based one) doesn't seem easy.
> 
> Why do we care about the old XLC? It doesn't support C++11/14, so only the newer clang-based version is usable with our current code base. Unless you were going to propose backporting this, which seems dubious to me but not my call.

Oh, if we do not care about old XLC shall we drop it elsewhere? I assume `TARGET_COMPILER_xlc` is the old XLC?

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PR: https://git.openjdk.org/jdk/pull/12114