RFR: 8168503 JEP 297: Unified arm32/arm64 Port

[Bob Vandette]

Please review the proposed changes to be integrated under JEP 297.

Summary:

This JEP adds arm32 and arm64 Linux platform support to OpenJDK for JDK 9.

This changeset also removes the support for the pregenerated interpreter since
this is no longer supported.

The addition of arm64 does not replace the existing aarch64 port.  A new configure 
option (-with-cpu-port=) allows for the selection of the existing aarch64 versus the 
64-bit arm64 support being added via this JEP.  Please refer to the JEP for more details.

JEP 297:

https://bugs.openjdk.java.net/browse/JDK-8168503

Webrev:

http://cr.openjdk.java.net/~bobv/8168503


Note:

A complete build-able forest containing these changes is located here: http://hg.openjdk.java.net/aarch32-port/jdk9-arm3264

Thanks,
Bob Vandette