[foreign-memaccess+abi] RFR: Add additional tests

[Per Minborg]

This PR adds yet other tests.

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Commit messages:
 - Add additional tests

Changes: https://git.openjdk.org/panama-foreign/pull/801/files
 Webrev: https://webrevs.openjdk.org/?repo=panama-foreign&pr=801&range=00
  Stats: 39 lines in 2 files changed: 36 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/panama-foreign/pull/801.diff
  Fetch: git fetch https://git.openjdk.org/panama-foreign pull/801/head:pull/801

PR: https://git.openjdk.org/panama-foreign/pull/801