RFR: JDK-8156067: aarch32: backport "Better byte behaviour" patch from aarch64 project (jdk8)

[Sergey Nazarkin]

Hi!

Please review adaptation of “Better byte behaviour” patch from AARCH64 project

-issue: https://bugs.openjdk.java.net/browse/JDK-8156067
-webrev: http://cr.openjdk.java.net/~snazarki/8156067/

-original patch: http://hg.openjdk.java.net/aarch64-port/jdk8u/hotspot/rev/388e9d0905e6

Please note this is no one-to-one copy. Few branches were omitted to make execution flow more linear and predictable.  Please correct me if I’m wrong. 

The need of new JDK issue is questionable  as well.  We may use the same “8132051” number in the description (as Andrew Hughes did) just for consistency with other u91 patches . However this issue is marked as confidential and I have no idea what about is it. 

Sergey Nazarkin