RFR(T) [15] : 8247716 : JVM_RegisterWhiteBoxMethods checks wrong classloader

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8247716/webrev.00
> 1 line changed: 0 ins; 0 del; 1 mod; 


Hi all,

could you please review this one-liner fix for JVM_RegisterWhiteBoxMethods method?
from JBS:
> JVM_RegisterWhiteBoxMethods is supposed to check that sun.hotspot.WhiteBox class is loaded by the boot classloader, yet it actually checks that java.lang.Class class is.

note: this had no impact, as NativeLookup::lookup_style would use JVM_RegisterWhiteBoxMethods as sun.hotspot.WhiteBox::registerNatives only if the class was load by the boot loader.

testing: tier1
JBS: https://bugs.openjdk.java.net/browse/JDK-8247716
webrev: http://cr.openjdk.java.net/~iignatyev//8247716/webrev.00

Thanks,
-- Igor