[15] RFR(S): 8246203: Segmentation fault in verification due to stack overflow with -XX:+VerifyIterativeGVN

[Christian Hagedorn]

Hi

Please review the following patch:
https://bugs.openjdk.java.net/browse/JDK-8246203
http://cr.openjdk.java.net/~chagedorn/8246203/webrev.00/

The testcase creates a deep graph with a lot of nodes on a chain. When 
running with -XX:+VerifyIterativeGVN, it recursively calls 
Node::verify_recur() for each input node discovered which eventually 
results in a segmentation fault due to a stack overflow (around 10000 
recursive calls due to such a long chain of nodes). The fix just 
converts the recursive algorithm into an iterative one to avoid a 
segmentation fault.

Thank you!

Best regards,
Christian