RFR: 8363357: Remove unused flag VerifyAdapterCalls

[Marc Chevalier]

It seems that the flag VerifyAdapterCalls is unused since [JDK-8350209](https://bugs.openjdk.org/browse/JDK-8350209), so pretty recently.

Let's remove it, very direct, no trick.

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Commit messages:
 - Remove VerifyAdapterCalls

Changes: https://git.openjdk.org/jdk/pull/26440/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26440&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8363357
  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/26440.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26440/head:pull/26440

PR: https://git.openjdk.org/jdk/pull/26440