[9] RFR JDK-8152344: JVMCI test task: Unit tests for ConstantReflectionProvider

[Konstantin Shefov]

Hello

Please review some new unit tests for methods of JVMCI 
jdk.vm.ci.hotspot.HotSpotConstantReflectionProvider class.

The tests cover most public methods of the class named above.

Here 
"test/compiler/jvmci/constantReflectionProviderTest/HotSpotConstantReflectionProviderTest.java" 
is the JTREG-testng file, all other classes are testng data providers, 
except TestHelper.java and DummyClass.java that store all necessary 
variables.

Bug: https://bugs.openjdk.java.net/browse/JDK-8152344
Webrev: http://cr.openjdk.java.net/~kshefov/8152344/webrev.00/

Thanks
-Konstantin