RFR(XS) 8142435: [JVMCI] restore missing InstalledCode.version increment

[Tom Rodriguez]

http://cr.openjdk.java.net/~never/8142435/webrev <http://cr.openjdk.java.net/~never/8142435/webrev>

The JVMCI InstalledCode object maintains a version counter that is incremented when an InstalledCode handle is associated with a new nmethod.  The code was accidentally deleted during a previous and simply needs to be restored.  Tested with Graal.

tom
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