The internal enum jdk.internal.util.Architecture does not provide information 
about the big or little endianness or the address size (64 or 32 bits).  The 
endian-ness and address size are intrinsic to the architecture.

The values of the enum are extended to separately identify the big endian and 
little-endian uses of the ISA.
For example, `PPC64` and `PPC64LE` for the big and little-endian versions.  
The enum values directly reflect the build-time artifacts and resulting 
executables.

This information about an architecture will make the enum more useful 
especially to identify a target platform in a cross-platform use case. A method 
is added to map well known aliases for the platforms to the Architecture enum.

-------------

Commit messages:
 - Correct address size for ARM (32-bit)
 - 8308452: Extend internal Architecture enum with byte order and address size

Changes: https://git.openjdk.org/jdk/pull/14063/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14063&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308452
  Stats: 134 lines in 4 files changed: 111 ins; 3 del; 20 mod
  Patch: https://git.openjdk.org/jdk/pull/14063.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14063/head:pull/14063

PR: https://git.openjdk.org/jdk/pull/14063

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