RFR: 8319316: Clarify text around which layouts a linker supports [v2]

[Maurizio Cimadamore]

On Fri, 3 Nov 2023 16:35:18 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> - Add linker note about packed structs.
>> - Relax language a bit to avoid implying that only listed layouts are supported.
>
> Jorn Vernee has updated the pull request incrementally with one additional commit since the last revision:
> 
>   add examples of packed structs

src/java.base/share/classes/java/lang/foreign/Linker.java line 249:

> 247:  * Linker implementations may optionally support additional layouts, such as <em>packed</em> struct layouts.
> 248:  * A packed struct is a struct in which there is at least one member layout {@code L} that has an alignment
> 249:  * constraint less than its natural alignment. This allows avoiding padding between member layouts,

Suggestion:

 * constraint less strict than its natural alignment. This allows avoiding padding between member layouts,

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PR Review Comment: https://git.openjdk.org/jdk/pull/16485#discussion_r1382060828