[11u] RFR: 8244719: CTW: C2 compilation fails with "assert(!VerifyHashTableKeys || _hash_lock == 0) failed: remove node from hash table before modifying it"

[Lindenmaier, Goetz]

Hi,

I am downporting this for parity with 11.0.9-oracle.
I had to adapt the bytecode version in the jasm file at line 26
to make it compile with 11. Test passes.

http://cr.openjdk.java.net/~goetz/wr20/8244719-remove_from_hash-jdk11/01/

Please review.

https://bugs.openjdk.java.net/browse/JDK-8244719
https://hg.openjdk.java.net/jdk/jdk/rev/e8d34f3f6833

Best regards,
  Goetz