8154867: PPC64: Better byte behavior

[Doerr, Martin]

Hi,

the PPC64 part of "Better byte behavior" (8148487) was done in jdk8u but is also needed in 9.

Here's the port for 9/dev:
http://cr.openjdk.java.net/~mdoerr/8154867_PPC64_Better_byte_behavior/webrev.00/

Please review.

Best regards,
Martin