(fs) DirectoryStream fails with SIGBUS on some embedded platforms, dirent alignment

Several JCK tests crash with SIGBUS in readdir64_r. The crash only happens when /proc/cpu/alignment is set not to ignore alignment errors (i.e. echo 5 > /proc/cpu/alignment). See Comments for more details.

# A fatal error has been detected by the Java Runtime Environment:
#
# SIGBUS (0x7) at pc=0x400fd7cc, pid=3863, tid=1081996400
#
# JRE version: 7.0_02-b12
# Java VM: Java HotSpot(TM) Client VM (22.0-b09 mixed mode, sharing linux-arm )
# Problematic frame:
# C [libc.so.6+0x907cc] readdir64_r+0xe0

Stack: [0x40790000,0x407e0000], sp=0x407dd2d8, free space=308k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C [libc.so.6+0x907cc] readdir64_r+0xe0

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j sun.nio.fs.UnixNativeDispatcher.readdir(J)[B+0
j sun.nio.fs.UnixDirectoryStream$UnixDirectoryIterator.readNextEntry()Ljava/nio/file/Path;+52
j sun.nio.fs.UnixDirectoryStream$UnixDirectoryIterator.hasNext()Z+16
j javasoft.sqe.tests.api.java.nio.file.Files.CpMvDelTests$2.runTest()Ljavasoft/sqe/javatest/Status;+212
j javasoft.sqe.tests.api.java.nio.Nio2TestCase$Single.runTestSafely()Ljavasoft/sqe/javatest/Status;+1
j javasoft.sqe.tests.api.java.nio.Nio2TestCase$Single.runTestWithPerms(Z[Ljava/security/Permission;)Ljavasoft/sqe/javatest/Status;+196
j javasoft.sqe.tests.api.java.nio.Nio2TestCase$Single.runTestWithAllPermsGranted()Ljavasoft/sqe/javatest/Status;+6
j javasoft.sqe.tests.api.java.nio.file.Files.CpMvDelTests.copy_DirDefault()Ljavasoft/sqe/javatest/Status;+101
v ~StubRoutines::call_stub
j sun.reflect.NativeMethodAccessorImpl.invoke0(Ljava/lang/reflect/Method;Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+0
j sun.reflect.NativeMethodAccessorImpl.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+87
j sun.reflect.DelegatingMethodAccessorImpl.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+6
j java.lang.reflect.Method.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+57
j javasoft.sqe.javatest.lib.MultiTest.invokeTestCase(Ljava/lang/reflect/Method;)Ljavasoft/sqe/javatest/Status;+8
j javasoft.sqe.javatest.lib.MultiTest.run([Ljava/lang/String;Ljava/io/PrintWriter;Ljava/io/PrintWriter;)Ljavasoft/sqe/javatest/Status;+152
j javasoft.sqe.javatest.lib.MultiTest.run([Ljava/lang/String;Ljava/io/PrintStream;Ljava/io/PrintStream;)Ljavasoft/sqe/javatest/Status;+40
j javasoft.sqe.tests.api.java.nio.file.Files.CpMvDelTests.main([Ljava/lang/String;)V+16
v ~StubRoutines::call_stub