RFR: JDK-8212053: A few more missing object equals barriers

[Roman Kennke]

 Testing and code analysis have revealed a couple more places where we
need oopDesc::equals() or oopDesc::equals_raw(). Those should really be
the last ones (notwithstanding new code of course):

in compressed oops, we should use equals_raw() because it's only used to
verify that we encoded/decoded the oop correctly a few lines above. It
cannot have been changed yet. In vframe, we need the usual
oopDesc::equals(..) because we may see different copies of the same object.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8212053
Webrev:
http://cr.openjdk.java.net/~rkennke/JDK-8212053/webrev.00/

Builds and runs hotspot/tier1 fine.

Ok?

Roman

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