RFR: Reimplement TsanOopMap support using WeakHandle and ResizeableResourceHashtable [v6]

[Jiangli Zhou]

On Wed, 24 Jul 2024 20:19:55 GMT, Man Cao <manc at openjdk.org> wrote:

> Even if we run into an entry whose _obj is freed, _wh.peek() should also return null in that case. So there's no need to look at _wh

That's true. I changed to just do `lhs._obj == rhs._obj`. I think it's safer to not add `lhs._obj != nullptr` assert.

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PR Review Comment: https://git.openjdk.org/tsan/pull/19#discussion_r1693708848