[foreign-memaccess+abi] RFR: Fix TestSegmentAllocators [v2]

[Maurizio Cimadamore]

> This patch fixes a test which started to fail as we have changed the delegation order in the SegmentAllocator methods.

Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:

  Drop redundant imports

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Changes:
  - all: https://git.openjdk.org/panama-foreign/pull/867/files
  - new: https://git.openjdk.org/panama-foreign/pull/867/files/f8963086..c6b9777d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=panama-foreign&pr=867&range=01
 - incr: https://webrevs.openjdk.org/?repo=panama-foreign&pr=867&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/panama-foreign/pull/867.diff
  Fetch: git fetch https://git.openjdk.org/panama-foreign.git pull/867/head:pull/867

PR: https://git.openjdk.org/panama-foreign/pull/867