RFR: 8346681: Shenandoah: Does not throw OOME when EATests expects it

[William Kemper]

The changes to this test reflect the similar changes for ZGC. The test was never backported to 21.

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Commit messages:
 - Shenandoah does not throw OOME when this tests expects it

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/147/files
  Webrev: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=147&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346681
  Stats: 16 lines in 1 file changed: 10 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/147.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/147/head:pull/147

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/147