[aarch64-port-dev ] RFR: Bug fixes for jdk8u from jdk9

[Edward Nevill]

Hi,

The following are a couple patches from jdk9 which fixes nasty bugs
(random SEGVs) and which I think should go into jdk8u.

OK to backport?
Ed.

--- CUT HERE ---
changeset:   10294:3f537d831d9d
parent:      10278:adf6fb6c302f
user:        aph
date:        Wed Feb 17 14:06:45 2016 +0000
files:       src/cpu/aarch64/vm/stubGenerator_aarch64.cpp
description:
8150045: arraycopy causes segfaults in SATB during garbage collection
Reviewed-by: roland

changeset:   10094:f776a0470c2c
user:        enevill
date:        Thu Feb 04 16:24:28 2016 +0000
files:       src/cpu/aarch64/vm/macroAssembler_aarch64.cpp
description:
8148783: aarch64: SEGV running SpecJBB2013
Summary: Fix calculation of offset for adrp
Reviewed-by: aph