[foreign-memaccess+abi] RFR: 8294970: Add linker option for saving thread-locals that the VM can overwrite [v4]

[Maurizio Cimadamore]

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On Wed, 26 Oct 2022 14:11:37 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> src/java.base/share/classes/java/lang/foreign/Linker.java line 319:
>> 
>>> 317:          *          before they can be read through conventional means}
>>> 318:          * <p>
>>> 319:          * A downcall method handle linked with this option will feature an additional {@link MemorySegment}
>> 
>> We should say somewhere that the additional segment should be a native segment (right?)
>
> I've changed the text a bit to specify that a native segment should be used.

Should we add a test for this?

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PR: https://git.openjdk.org/panama-foreign/pull/742