FTR: Old JBS entries for header size reduction.

[John Rose]

I just ran across these in my JBS “drafts” (which are really notes).
I probably mentioned most of these ideas before, but the write-ups
might possibly trigger more such ideas, now that more people are
working on such things.  Cheers.

Remove klass word from objects
https://bugs.openjdk.java.net/browse/JDK-8198332

Remove mark word from objects
https://bugs.openjdk.java.net/browse/JDK-8198331