[foreign] RFR 8218153: Read/Write of Value layout should honor declared endianness

[Henry Jen]

Hi,

Please review the webrev[1] that perform necessary conversion based on declared endianness of Value layout.

In the webrev, also fixed some issues:

1. enum constant need to have  ACC_FINAL
2. union field offset is not correct

[1] https://cr.openjdk.java.net/~henryjen/panama/endianness/03/webrev/

Cheers,
Henry