RFR: 8309599: WeakHandle and OopHandle release should clear obj pointer

[Coleen Phillimore]

On Thu, 28 Sep 2023 01:46:37 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Hmmm okay - it seems fragile to have a psuedo-destructor in release().

I don't know what this comment means.  It was fragile to *not* have release destroy the _obj pointer, which was the cause of the original confusion and problems while fixing the object monitor deflation code.

Thanks Kim and David for the code reviews.

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PR Comment: https://git.openjdk.org/jdk/pull/15920#issuecomment-1739005387