RFR(S): JDK-8139438: [TESTBUG] JVMCI test fails with RuntimeException: Has no virtual object before materialization

[Dmitrij Pochepko]

Hi,

please review a small fix for test: 
compiler/jvmci/compilerToVM/MaterializeVirtualObjectTest.java

Description:

A test is changed to run testcases in separate VM launch instead of 
consecutive execution, which had wrong assumption about method 
compilation state in case of -XX:-TieredCompilation.
So, a boolean system property is added into test to control test 
execution logic externally.
I've also added minor code cleanup.

webrev: http://cr.openjdk.java.net/~dpochepk/8139438/webrev.01/

Thanks,
Dmitrij
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