Review Request JDK-8177844: Ensure non-upgradeable modules cannot be upgraded even with --patch-module

Mandy Chung mandy.chung at
Sat Apr 8 05:50:50 UTC 2017

This fixes -—patch-module to do hash checking on the module being patched
so that it will ensure that a non-upgradeable module remains not upgradeable.

As Graal has been using —-patch-module option to disable the hash checking
to load a different version of jdk.internal.vm.compiler, it needs a 
mechanism to load Graal, as tracked by JDK-8177845.


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