RR(XS): 8039050: Crash in C2 compiler at Node::rematerialize

[Sergey Gabdurakhmanov]

Hello,

Please approve a direct backport from JDK9 to JDK7

webrev: http://cr.openjdk.java.net/~sgabdura/8039050/webrev.00/
bug: https://bugs.openjdk.java.net/browse/JDK-8039050
JDK9 changeset: 
http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/218bc7e588be

BR,
Sergey