RFR(XS): Trivial: 8200202: Remove unused _boot_modules_array and _platform_modules_array from classLoader.*

[Jiangli Zhou]

Please review this trivial change that removes the unused _boot_modules_array and _platform_modules_array from classLoader.hpp and classLoader.cpp.

webrev: http://cr.openjdk.java.net/~jiangli/8200202/webrev.00/
bug: https://bugs.openjdk.java.net/browse/JDK-8200202

Testing with hs-tier1 & hs-tier2.

Thanks,
Jiangli