RFR(S): 8217043: Shenandoah: SIGSEGV in Type::meet_helper() at barrier expansion time

[Roman Kennke]

Ok.

Thanks,
Roman

> http://cr.openjdk.java.net/~roland/8217043/webrev.00/
> 
> The ShenandoahBarrierNode::needs_barrier_impl() encounters a
> CallLeafNode (from a write barrier) and tries to get the type of n which
> is a tuple, not a pointer and this causes a null pointer
> dereference. The write barrier runtime call should anyway prevent an
> optimization of the barrier and to be on the safe side, any call should.
> 
> Roland.
> 

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