RFC: [8u] Pick up 8u151 to sh/jdk8u

[Aleksey Shipilev]

Hi,

I'd like to pick up trivial merge from 8u151 update posted here:
  http://hg.openjdk.java.net/aarch64-port/jdk8u/

Merges without conflicts, passes hotspot_gc_shenandoah {fastdebug|release} without problems.

Concerns?

Thanks,
-Aleksey