[foreign-memaccess+abi] RFR: Add var handle support for boolean and MemoryAddress carrier

[Maurizio Cimadamore]

On Tue, 29 Jun 2021 12:24:52 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> Add var handle support for boolean and MemoryAddress carrier

This change is now ready for review - I did some minor cleanups and added a test for boolean downcalls, which revealed a couple of missing changes in the linker machinery.

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PR: https://git.openjdk.java.net/panama-foreign/pull/564