RFR 8038418 New tests development for type profiling and speculation

[Roland Westrelin]

> But what if the collectReturnType(obj) will change the obj inside the method?
> E.g. before it was a TypeHierarchy.B, but became a TypeHierarchy. I thought 
> that it should use return type profiling for this case:

The first profiling data that it finds for an object is the one that it keeps. Later profiling data is ignored.

> but why does compiler not eliminate if() when isReturnType == true and is a 
> final field? 

Maybe it does indeed. Have you verified whether it is eliminated?

Roland.