Missing bounds checks for some String intrinsics

# SIGSEGV (0xb) at pc=0x0000007fa4726ec0, pid=3211, tid=3218
#
# JRE version: Java(TM) SE Runtime Environment (9.0) (build 9-internal+0-2016-05-26-211740.amurillo.jdk9-hs-2016-05-26-snapshot)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (9-internal+0-2016-05-26-211740.amurillo.jdk9-hs-2016-05-26-snapshot, compiled mode, tiered, compressed oops, g1 gc, linux-aarch64)
# Problematic frame:
# V [libjvm.so+0x3d2ec0] CollectedHeap::fill_with_objects(HeapWord*, unsigned long, bool)+0xa8
#
# Core dump will be written. Default location: Core dumps may be processed with "/usr/share/apport/apport %p %s %c %P" (or dumping to /export/local/aurora/sandbox/results/ResultDir/stressHierarchy009/core.3211)


--------------- S U M M A R Y ------------

Command Line: -XX:MaxMetaspaceSize=450m -Xss10m -Xbootclasspath/a:/export/local/aurora/CommonData/vm/lib/wb.jar -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xcomp -XX:+CreateCoredumpOnCrash -XX:+IgnoreUnrecognizedVMOptions -XX:ReservedCodeCacheSize=256M -Xcomp metaspace.stressHierarchy.common.StressHierarchy3 -treeDepth 70 -minLevelSize 10 -maxLevelSize 100 -hierarchyType INTERFACES -triggerUnloadingByFillingMetaspace

Host: AArch64 Processor rev 0 (aarch64), 8 cores, 15G, Ubuntu 14.04.3 LTS
Time: Fri May 27 10:15:09 2016 PDT elapsed time: 26 seconds (0d 0h 0m 26s)

--------------- T H R E A D ---------------

Current thread (0x0000007f9c029000): GCTaskThread "GC Thread#0" [stack: 0x0000007fa344a000,0x0000007fa354a000] [id=3218]

Stack: [0x0000007fa344a000,0x0000007fa354a000], sp=0x0000007fa3548740, free space=1017k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x3d2ec0] CollectedHeap::fill_with_objects(HeapWord*, unsigned long, bool)+0xa8
V [libjvm.so+0x4dc5b8] RemoveSelfForwardPtrHRClosure::doHeapRegion(HeapRegion*)+0x190
V [libjvm.so+0x4c2a54] G1CollectedHeap::collection_set_iterate_from(HeapRegion*, HeapRegionClosure*)+0x3c
V [libjvm.so+0x4dc26c] G1ParRemoveSelfForwardPtrsTask::work(unsigned int)+0x9c
V [libjvm.so+0x9db9ac] GangWorker::loop()+0x50
V [libjvm.so+0x9db888] AbstractGangWorker::run()+0x2c
V [libjvm.so+0x825fe4] thread_native_entry(Thread*)+0x104
C [libpthread.so.0+0x7e2c] start_thread+0xb0


siginfo: si_signo: 11 (SIGSEGV), si_code: 2 (SEGV_ACCERR), si_addr: 0x00000006d4c3093c