[foreign-memaccess+abi] RFR: Fix failing test

[Per Minborg]

This PR fixes a failing test.

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Commit messages:
 - Fix failing test

Changes: https://git.openjdk.org/panama-foreign/pull/799/files
 Webrev: https://webrevs.openjdk.org/?repo=panama-foreign&pr=799&range=00
  Stats: 2 lines in 2 files changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/panama-foreign/pull/799.diff
  Fetch: git fetch https://git.openjdk.org/panama-foreign pull/799/head:pull/799

PR: https://git.openjdk.org/panama-foreign/pull/799