[foreign-abi] RFR: 8249803: Add LibraryLookup.Symbol [v2]

[Paul Sandoz]

On Tue, 21 Jul 2020 16:04:29 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> This patch adds the LibraryLookup.Symbol, which implements Addressable, and that is returned on a successful symbol
>> lookup. This patch also tweaks VaList to also implement the Addressable interface (VaList already had an `address()`
>> method).  The `ForeignLinker::downcallHandle` method has been tweaked to accept an Addressable as a function entry
>> point. This allows downcall handle to target not only native symbols, but also upcall stubs (since upcall stubs are
>> segments, which are addressable) as well as native memory addresses.  Some tests needed minor tweaks.
>
> Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Address review comments

Marked as reviewed by psandoz (Committer).

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PR: https://git.openjdk.java.net/panama-foreign/pull/256