Review comments form 8034181, forgotten in original commit.
  http://mail.openjdk.java.net/pipermail/net-dev/2014-March/008353.html

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This looks okay to me and I wouldn't expect the malloc'ed case to be common.

One comment on the test is that "75" isn't obvious and might be useful
as a constant at the top to explain that it's the total number of
combinations.

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