Anti-dependency on membar causes crash in register allocator due to invalid instruction scheduling

jdk9 PIT,
closed/java/lang/Enum/CloneEnumConstant.java crashed two times on different hosts

;; Using jvm: "/scratch/home/aurora/CommonData/TEST_JAVA_HOME/lib/server/libjvm.so"
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007f2b77d52cf0, pid=29533, tid=29602
#
# JRE version: Java(TM) SE Runtime Environment (9.0) (fastdebug build 9-internal+0-2017-01-13-173800.jesper.dev1780-hs)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 9-internal+0-2017-01-13-173800.jesper.dev1780-hs, compiled mode, compressed oops, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x86acf0] RegMask::AND(RegMask const&)+0x0
#
# Core dump will be written. Default location: Core dumps may be processed with "/usr/libexec/abrt-hook-ccpp %s %c %p %u %g %t e" (or dumping to /scratch/home/aurora/sandbox/results/workDir/closed/java/lang/Enum/CloneEnumConstant/core.29533)
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#

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

Command Line: -Dtest.src=/scratch/home/aurora/CommonData/j2se_jdk/jdk/test/closed/java/lang/Enum -Dtest.src.path=/scratch/home/aurora/CommonData/j2se_jdk/jdk/test/closed/java/lang/Enum -Dtest.classes=/scratch/home/aurora/sandbox/results/workDir/classes/15/closed/java/lang/Enum -Dtest.class.path=/scratch/home/aurora/sandbox/results/workDir/classes/15/closed/java/lang/Enum -Dtest.vm.opts= -Dtest.tool.vm.opts= -Dtest.compiler.opts= -Dtest.java.opts=-Xcomp -Xcomp -XX:MaxRAMFraction=8 -XX:+CreateCoredumpOnCrash -ea -esa -XX:CompileThreshold=100 -XX:+UnlockExperimentalVMOptions -server -XX:-TieredCompilation -XX:+IgnoreUnrecognizedVMOptions -XX:+AggressiveOpts -XX:-UseBiasedLocking -Dtest.jdk=/export/home/aurora/CommonData/TEST_JAVA_HOME -Dcompile.jdk=/export/home/aurora/CommonData/TEST_JAVA_HOME -Dtest.timeout.factor=16.0 -Dtest.modules=java.corba/com.sun.corba.se.impl.copyobject java.corba/com.sun.corba.se.spi.copyobject -Dtest.nativepath=/export/home/aurora/sandbox/JTREG_NATIVEPATH_LIBRARY_PREPARED --add-modules=java.corba --add-exports=java.corba/com.sun.corba.se.impl.copyobject=ALL-UNNAMED --add-exports=java.corba/com.sun.corba.se.spi.copyobject=ALL-UNNAMED -Xcomp -Xcomp -XX:MaxRAMFraction=8 -XX:+CreateCoredumpOnCrash -ea -esa -XX:CompileThreshold=100 -XX:+UnlockExperimentalVMOptions -XX:-TieredCompilation -XX:+IgnoreUnrecognizedVMOptions -XX:+AggressiveOpts -XX:-UseBiasedLocking -Djava.library.path=/export/home/aurora/sandbox/JTREG_NATIVEPATH_LIBRARY_PREPARED com.sun.javatest.regtest.agent.MainWrapper /scratch/home/aurora/sandbox/results/workDir/closed/java/lang/Enum/CloneEnumConstant.d/main.1.jta

Host: scaaa603.us.oracle.com, Intel(R) Xeon(R) CPU E5-2690 0 @ 2.90GHz, 32 cores, 251G, Oracle Linux Server release 7.0
Time: Sat Jan 14 12:53:36 2017 PST elapsed time: 44 seconds (0d 0h 0m 44s)

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

Current thread (0x00007f2b7053c6b0): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=29602, stack(0x00007f2a60690000,0x00007f2a60791000)]


Current CompileTask:
C2: 44913 5843 !b com.sun.corba.se.impl.io.IIOPOutputStream::simpleWriteObject (176 bytes)

Stack: [0x00007f2a60690000,0x00007f2a60791000], sp=0x00007f2a6078c0d8, free space=1008k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x86acf0] RegMask::AND(RegMask const&)+0x0;; RegMask::AND(RegMask const&)+0x0
V [libjvm.so+0x869b66] PhaseChaitin::Register_Allocate()+0x4c6;; PhaseChaitin::Register_Allocate()+0x4c6
V [libjvm.so+0x9e5f79] Compile::Code_Gen()+0x3a9;; Compile::Code_Gen()+0x3a9
V [libjvm.so+0x9e9b4a] Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bool, bool, bool, DirectiveSet*)+0x130a;; Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bool, bool, bool, DirectiveSet*)+0x130a
V [libjvm.so+0x819062] C2Compiler::compile_method(ciEnv*, ciMethod*, int, DirectiveSet*)+0x2e2;; C2Compiler::compile_method(ciEnv*, ciMethod*, int, DirectiveSet*)+0x2e2
V [libjvm.so+0x9f5156] CompileBroker::invoke_compiler_on_method(CompileTask*)+0x3d6;; CompileBroker::invoke_compiler_on_method(CompileTask*)+0x3d6
V [libjvm.so+0x9f5df1] CompileBroker::compiler_thread_loop()+0x2b1;; CompileBroker::compiler_thread_loop()+0x2b1
V [libjvm.so+0x15f8a9e] JavaThread::thread_main_inner()+0x22e;; JavaThread::thread_main_inner()+0x22e
V [libjvm.so+0x15f8d2e] JavaThread::run()+0x1ce;; JavaThread::run()+0x1ce
V [libjvm.so+0x1347032] thread_native_entry(Thread*)+0x112;; thread_native_entry(Thread*)+0x112
C [libpthread.so.0+0x7dc5] start_thread+0xc5