RFR: JDK-8300783: Consolidate byteswap implementations [v12]

[David Holmes]

On Fri, 27 Jan 2023 17:00:58 GMT, Justin King <jcking at openjdk.org> wrote:

>> Deduplicate byte swapping implementations by consolidating them into `utilities/byteswap.hpp`, following `std::byteswap` introduced in C++23. Further simplification of `Bytes` will follow in https://github.com/openjdk/jdk/pull/12078.
>
> Justin King has updated the pull request incrementally with four additional commits since the last revision:
> 
>  - Update copyright
>    
>    Signed-off-by: Justin King <jcking at google.com>
>  - Add missing include
>    
>    Signed-off-by: Justin King <jcking at google.com>
>  - Remove unused include
>    
>    Signed-off-by: Justin King <jcking at google.com>
>  - Reorganize tests
>    
>    Signed-off-by: Justin King <jcking at google.com>

Updates are fine - thanks.

I'll try to get someone to properly review this.

test/hotspot/gtest/utilities/test_byteswap.cpp line 2:

> 1: /*
> 2:  * Copyright (c) 2022, 2023, Oracle and/or its affiliates. All rights reserved.

As a new file this should only have 2023 copyright year - thanks.

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