[9] RFR (XS): 8058825: EA: ConnectionGraph::split_unique_types does incorrect scalar replacement

[Roland Westrelin]

> What I saw on 9 is that there are no eliminated allocations on the test. I experimented a little [1] with the test case and it seems the new shape doesn't allow both allocations to go away. Both allocations go away on 8u40 and there's no allocation elimination on 9.

Is it related to this?

https://bugs.openjdk.java.net/browse/JDK-8058746

I have a fix for this one going out soon.

Roland.