[foreign-memaccess+abi] RFR: 8292174: Add unaligned layouts to ValueLayout [v4]

[Per Minborg]

On Fri, 12 Aug 2022 13:51:57 GMT, Per Minborg <duke at openjdk.org> wrote:

>> src/java.base/share/classes/java/lang/foreign/ValueLayout.java line 652:
>> 
>>> 650:     }
>>> 651: 
>>> 652:     // Some constants below are accessed from generated bytecode, see BindingSpecializer::emitLoadLayoutConstant
>> 
>> Which constants "below" ? The comment would have been perfect in the old code, but now it seems the constants have been removed?
>
> The constants JAVA_BYTE. JAVA_BOOLEAN and JAVA_*_UNALIGNED are used.

So, before they were all in a special class (Platform) but now the public layouts are used.

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PR: https://git.openjdk.org/panama-foreign/pull/705