RFR: ZGC: C2: Remove assert in PhaseIdealLoop::split_barrier_thru_phi()

[Nils Eliasson]

Good,

// Nils


On 2018-05-14 13:41, Per Liden wrote:
> Nils added this assert to be able to catch and further investigate 
> when this happens. We found a reproducer, so we can remove this now.
>
> http://cr.openjdk.java.net/~pliden/zgc/remove_split_phi_assert/webrev.0
>
> /Per