Hit this assertion failure

# assert(SafepointMechanism::local_poll_armed(_handshakee)) failed: Must be

while running vmTestbase/vm/mlvm/indy/stress/java/relinkMutableCallSiteFreq/Test.java on Linux-x64.

Current thread (0x00007f1070382050): VMThread "VM Thread" [stack: 0x00007f0fd4f00000,0x00007f0fd5000000] [id=12305] _threads_hazard_ptr=0x00007f0fb4c39d90, _nested_threads_hazard_ptr_cnt=0

Stack: [0x00007f0fd4f00000,0x00007f0fd5000000], sp=0x00007f0fd4ffe730, free space=1017k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0xd78603] HandshakeState::try_process(HandshakeOperation*)+0x293
V [libjvm.so+0xd7a1f6] VM_HandshakeAllThreads::doit()+0x2e6
V [libjvm.so+0x19a91fa] VM_Operation::evaluate()+0x18a
V [libjvm.so+0x19cccc3] VMThread::evaluate_operation(VM_Operation*)+0x183
V [libjvm.so+0x19cd8c0] VMThread::inner_execute(VM_Operation*)+0x180
V [libjvm.so+0x19cdb95] VMThread::loop()+0xb5
V [libjvm.so+0x19cdcc7] VMThread::run()+0xc7
V [libjvm.so+0x18b6ed0] Thread::call_run()+0x100
V [libjvm.so+0x15842be] thread_native_entry(Thread*)+0x10e

Seen in an ad hoc mach5 test job in with just some ParallelGC changes, and this failure wasn't using that GC.