[foreign-memaccess+abi] RFR: Revert changes to ValueLayout.OfAddress::toString

[Maurizio Cimadamore]

The patch for unifying memory segment and memory address contained some changes to tweak address layout toString method, so that the layout would show whether dereference was safe or not. I think that went too far - an address layout is still 32/64 bits, and capturing dereference properties in toString representation is not helpful (and can actually be confusing, attra>

This patch also fixes a failure in a test that was imported from jdk/jdk during last week's automatic merge.

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Commit messages:
 - Revert changes to ValueLayout.OfAddress::toString

Changes: https://git.openjdk.org/panama-foreign/pull/697/files
 Webrev: https://webrevs.openjdk.org/?repo=panama-foreign&pr=697&range=00
  Stats: 12 lines in 2 files changed: 0 ins; 9 del; 3 mod
  Patch: https://git.openjdk.org/panama-foreign/pull/697.diff
  Fetch: git fetch https://git.openjdk.org/panama-foreign pull/697/head:pull/697

PR: https://git.openjdk.org/panama-foreign/pull/697