RFR: 8304915: Create jdk.internal.util.Architecture enum and apply [v9]

[ExE Boss]

On Tue, 11 Apr 2023 10:15:27 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove unused static and import of Stabile
>
> test/jdk/jdk/internal/util/ArchTest.java line 128:
> 
>> 126:             case RISCV64 -> true;
>> 127:             case S390 -> false;
>> 128:             case PPC64 -> true;
> 
> This is not always true. The PPC64 architecture supports both endianness versions. AIX and legacy linux is Big Endian while recent linux is little Endian (determined by platform name "os.arch = ppc64le" instead of "os.arch = ppc64"). Querying the endianness is also possible, of course.

This should (probably) be correct:
Suggestion:

            case PPC64 -> !OperatingSystem.isAix() && Architecture.isLittleEndian();

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PR Review Comment: https://git.openjdk.org/jdk/pull/13357#discussion_r1162614588