RFR(S) 8251271- C2: Compile::_for_igvn list is corrupted after RenumberLiveNodes

[Nhat Nguyen]

Hi hotspot-compiler-dev,

Please review the following patch to address https://bugs.openjdk.java.net/browse/JDK-8251271
The bug is currently assigned to Christian Hagedorn, but he was supportive of me submitting the patch instead.
I have run hotspot/tier1 and jdk/tier1 tests to make sure that the change is working as intended.

webrev: http://cr.openjdk.java.net/~burban/nhat/JDK-8251271/webrev.00/

Thank you,
Nhat