[9] RFR 8149472: NPE when executing HotSpotConstantReflectionProvider::constantEquals with null first arg

[Konstantin Shefov]

Hello

Please review a bug fix in JVMCI 
jdk.vm.ci.hotspot.HotSpotConstantReflectionProvider::constantEquals(Constant 
x, Constant y) method.

A NullPointerException is thrown, when one calls this method with the 
first argument x equal to null.

Additional check should be added for null as the first argument.

Bug: https://bugs.openjdk.java.net/browse/JDK-8149472
Webrev: http://cr.openjdk.java.net/~kshefov/8149472/webrev.00/

Thanks
-Konstantin

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