[jdk21u] RFR: 8267509: Improve IllegalAccessException message to include the cause of the exception

[Aleksey Shipilev]

Clean backport to improve diagnostics in hairy MH code.

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Commit messages:
 - Backport 36314a90c15e2ab2a9b32c2e471655c1b07d452c

Changes: https://git.openjdk.org/jdk21u/pull/284/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=284&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8267509
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u/pull/284.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/284/head:pull/284

PR: https://git.openjdk.org/jdk21u/pull/284