RFR: 8138799 - improve tests for CompilerToVM::MaterializeVirtualObjectTest

[Dmitrij Pochepko]

Hi,

please review patch for 8138799 - improve tests for 
CompilerToVM::MaterializeVirtualObjectTest

This patch adds logic which checks that frame materialization doesn't 
affect previous or next frame.


webrev: http://cr.openjdk.java.net/~dpochepk/8138799/webrev.01/

CR: https://bugs.openjdk.java.net/browse/JDK-8138799

I've tested this patch on linux-x64.


Thanks,

Dmitrij