RFR(M): 8004073: Implement C2 Ideal node specific dump() method

[Roland Westrelin]

> thank you for your comments. I have uploaded a revised webrev to http://cr.openjdk.java.net/~mhaupt/8004073/webrev.01; some replies are inlined below.

That looks good to me.

In subnode.cpp comment:
1439 //---------------------------------rel-----------------------------------------
doesn’t match function name.

Roland.