RFR (trivial): JDK-8211269: Make declaration of Allocation protected in MemAllocator

[Roman Kennke]

 I want to override mem_allocate(Allocation&) but can't because I cannot
access the private class Allocation. Let's make it protected.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8211269
Webrev:
http://cr.openjdk.java.net/~rkennke/JDK-8211269/webrev.00/

Ok? Also, counts as trivial I suppose?

Thanks,
Roman

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