RFR(M): 8216135: C2 assert(!had_error) failed: bad dominance

[Roland Westrelin]

Hi Tobias,

> Nice analysis! Still took me a while to review but the fix looks good (I've also executed some
> extended testing and all passed). Let's hope this skeleton predicate stuff is finally stable.

Thanks for the review.

FTR, I will also need to undo:

http://hg.openjdk.java.net/jdk/jdk12/rev/ea921dca7f33

when I push this.

Roland.