RFR (M) 8035605: Expand functionality of PredictedIntrinsicGenerator

[Roland Westrelin]

> We can't call transform() in merge_memory() because we don't know when Phi node is completed (when all paths are processed). I added transformation loop after merge_memory() calls.
> 
> New webrev (only callGenerator.cpp was changed):
> 
> http://cr.openjdk.java.net/~kvn/8035605/webrev.01

Maybe the transformation loop should be factored in its own method? Anyway that looks good to me.

Roland.