[foreign-memaccess+abi] RFR: 8274978: Add implicit allocator factory

[Paul Sandoz]

On Fri, 8 Oct 2021 14:11:37 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> When rewriting tests, and also jextract, we found that the "implicit" segment allocator - that is, an allocator which returns native segments backed by fresh implicit scopes, is used quite frequently.
> 
> This patch adds a blessed factory for it, and it beefs up the allocator test, so that all allocators are tested (except for prefix, which is kind of peculiar).

Marked as reviewed by psandoz (Committer).

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PR: https://git.openjdk.java.net/panama-foreign/pull/595