RFR: 8304915: Create jdk.internal.util.Architecture enum and apply [v10]

[Martin Doerr]

On Tue, 11 Apr 2023 17:58:54 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> Define an internal jdk.internal.util.Architecture enumeration and static methods to replace uses of the system property `os.arch`.
>> The enumeration values are defined to match those used in the build.
>> The initial values are: `X64, X86, AARCH64, RISCV64, S390, PPC64`
>> Note that `amd64` and `x86_64` in the build are represented by `X64`.
>> The value of the system property `os.arch` is unchanged.
>> 
>> The API is similar to the jdk.internal.util.OperatingSystem enum created by #[12931](https://git.openjdk.org/jdk/pull/12931).
>> Uses in `java.base` and a few others are included but other modules will be done in separate PRs.
>
> Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Modified test to check Architecture is64bits() and isLittleEndian()
>   against Unsafe respective values.
>   Relocated code mapping OS name and arch name from PlatformProps to
>   OperatingSystem and Architecture. Kept the mapping of names
>   in the template close to where the values are filled in by the build.

Another remark: Old JDK on s390 used "os.arch = zArch_64", current one "os.arch = s390x". @offamitkumar: You probably want to take a look.

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PR Comment: https://git.openjdk.org/jdk/pull/13357#issuecomment-1503861585