RFR: Disable verification of adjusted capacity

[William Kemper]

This assertion is also tied to code we are actively working to replace.

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Commit messages:
 - Disable verification of adjusted capacity

Changes: https://git.openjdk.org/shenandoah/pull/258/files
 Webrev: https://webrevs.openjdk.org/?repo=shenandoah&pr=258&range=00
  Stats: 6 lines in 1 file changed: 1 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/shenandoah/pull/258.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah.git pull/258/head:pull/258

PR: https://git.openjdk.org/shenandoah/pull/258