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

[Maurizio Cimadamore]

On Thu, 11 Aug 2022 07:45:32 GMT, Per Minborg <duke at openjdk.org> wrote:

> `JAVA_BYTE` and `JAVA_BOOLEAN` are implicitly unaligned. We could either:
> 
>     * provide `JAVA_BYTE_UNALIGNED` for symmetry which is identical to `JAVA_BYTE` (and the same for boolean).
> 
>     * provide neither `JAVA_BYTE_UNALIGNED` nor `JAVA_BYTE_UNALIGNED`

Leave alone UNALIGNED for 8-bit entities. I think that's fine.

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