[11u] RFR: 8249607: C2: assert(!had_error) failed: bad dominance

[Lindenmaier, Goetz]

HI

I am downporting this for parity with 11.0.10-oracle.

http://cr.openjdk.java.net/~goetz/wr20/8249607-bad_dominance-jdk11/01/

I had to do real trivial resolves in loopnode.hpp due to space
Differences in the context.

https://bugs.openjdk.java.net/browse/JDK-8249607
https://hg.openjdk.java.net/jdk/jdk/rev/05d7a0663063

Best regards,
  Goetz.