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

[Glavo]

On Wed, 5 Apr 2023 15:58:08 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, IA64, ARM, AARCH64, RISCV64, S390X, PPC64LE`
> Note that `amd64` and `x86_64` in the build are represented by `X64`.
> The values 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.

src/java.base/share/classes/jdk/internal/util/Architecture.java line 77:

> 75:      * {@return {@code true} if the current architecture is IA64}
> 76:      */
> 77:     public static boolean isIA64() {

Why is the name case correct only for IA-64, while `AArch64`, `RISC-V 64` and other architectures only have the first letter capitalized?

I think names like `isRiscv64`, `isPpc64le`, and `isAarch64` are quite ugly, and there is no precedent yet.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13357#discussion_r1158748071