RFR: JDK-8204970: Remaing object comparisons need to use oopDesc::equals()

[Roman Kennke]

We found 2 more places where oopDesc::equals() should be used instead of
raw obj==obj.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8204970
Webrev:
http://cr.openjdk.java.net/~rkennke/JDK-8204970/webrev.00/

Passes tier1 tests

Can I get a review?

Thanks,
Roman

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