[11u] RFR 8229994: assert(false) failed: Bad graph detected in get_early_ctrl_for_expensive

[Aleksey Shipilev]

Original bug:
  https://bugs.openjdk.java.net/browse/JDK-8229994
  https://hg.openjdk.java.net/jdk/jdk/rev/4938269b8b17

The patch is simple, but it does not apply to 11u because of the whitespace difference. I had to
reapply the patch by hand. 11u webrev:
  https://cr.openjdk.java.net/~shade/8229994/webrev.11u.01/

Testing: new test (fails before, passes after); tier{1,2,3}

-- 
Thanks,
-Aleksey