RFR: 8296024: Usage of DIrectBuffer::address should be guarded [v3]

[Per Minborg]

On Mon, 21 Nov 2022 12:19:21 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> maybe just `bufferLock` and and just `acquireBuffer` ?
>
> Would it be possible to re-examine acquireSession returning Runnable and 
> acquireSessionAsAutoCloseable returning AutoCloseable. The naming is bit awkward at most of the use sites and maybe we can do better.

I think it would be confusing to have overloads with the same name. 

The `aquireSession(Buffer, boolean)` method is only used once and is used in `IOUtil` so we could rename it to `aquireSessionOrNull` and then rename `acquireSessionAsAutoCloseable` to `acquireSession`.

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PR: https://git.openjdk.org/jdk/pull/11260