RR(XS): 8038785: hot workaround fix for a crash in C2 compiler at Node::rematerialize

[Sergey Gabdurakhmanov]

Hello,

Here is webrev of changes I'm about to integrate:

webrev: http://cr.openjdk.java.net/~sgabdura/8038785/webrev.00/
bug: https://bugs.openjdk.java.net/browse/JDK-8038785

This is a hot workaround fix for JDK7.
Proper fix for JDK8 and JDK9 will be done under the bug
https://bugs.openjdk.java.net/browse/JDK-8039050

Please check JDK-8039050 for additional details.

BR,
Sergey