[aarch64-port-dev ] RFR: Critical Shenandoah patch for interpreter

[Roman Kennke]

The aarch64-port/jdk8u-shenandoah forest already has the ztos handling
code in the interpreter, that we don't yet have in Shenandoah's jdk8u
repository, and for that reason was lacking a write-barrier in the bool
putfield handler.

http://cr.openjdk.java.net/~rkennke/interpr-boolean-wb/webrev.00/

You might need to do the same for aarch64's interpreter?

Roman