[jdk17u-dev] RFR: 8287854: Dangling reference in ClassVerifier::verify_class

[Aleksey Shipilev]

Clean backport to improve verifier reliability.

Additional testing:
 - [ ] Linux x86_64 fastdebug `tier1 tier2 tier3`

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Commit messages:
 - Backport 3fa99844a69401f84677e7d512ffd937f7f16898

Changes: https://git.openjdk.org/jdk17u-dev/pull/1384/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1384&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287854
  Stats: 13 lines in 2 files changed: 0 ins; 8 del; 5 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1384.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1384/head:pull/1384

PR: https://git.openjdk.org/jdk17u-dev/pull/1384