Marlin renderer causes unaligned write accesses

The code pushed with JDK-8143849 crashes SPECjvm2008 on SPARC because it calls Unsafe.putInt() with an unaligned address (0x10102657a is not Integer aligned).

http://hg.openjdk.java.net/jdk9/client/jdk/file/73b93c545ceb/src/java.desktop/share/classes/sun/java2d/marlin/MarlinCache.java#l474

Steps to reproduce:
java -jar ./SPECjvm2008.jar --showversion startup.helloworld -ikv

#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGBUS (0xa) at pc=0xfffffffc6a433e4c, pid=17795, tid=2
#
# JRE version: Java(TM) SE Runtime Environment (9.0) (build 9-internal+0-2015-12-07-011940.tohartma.hs-comp)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (9-internal+0-2015-12-07-011940.tohartma.hs-comp, mixed mode, tiered, compressed oops, g1 gc, solaris-sparc)
# Problematic frame:
# V [libjvm.so+0x1133e4c] Unsafe_SetNativeInt+0x15c
#
# Core dump will be written. Default location: /tmp/tohartma/refworkload/benchmarks/specjvm2008/core or core.17795
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
J 1128 jdk.internal.misc.Unsafe.putInt(JI)V (0 bytes) @ 0xffffffff6446bf4c [0xffffffff6446bee0+0x000000000000006c]
j sun.java2d.marlin.MarlinCache.copyAARowRLE_WithBlockFlags([I[IIII)V+377
J 1259 C1 sun.java2d.marlin.Renderer.copyAARow([IIIIZ)V (69 bytes) @ 0xffffffff5d756e68 [0xffffffff5d756bc0+0x00000000000002a8]
J 1277 C1 sun.java2d.marlin.Renderer._endRendering(II)V (2400 bytes) @ 0xffffffff5d76b4bc [0xffffffff5d766780+0x0000000000004d3c]
j sun.java2d.marlin.Renderer.endRendering(I)V+49
j sun.java2d.marlin.Renderer.endRendering()Z+368
[...]