RFR: 8287854: Dangling reference in ClassVerifier::verify_class

[Harold Seigel]

Please review this small change to fix JDK_8287854.  The fix was tested with JCK lang and VM tests, Mach5 tiers 1 and 2 on Linux, Mac OS, and Windows (in progress), and Mach5 tiers 3-5 on Linux x64.

Thanks, Harold

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Commit messages:
 - 8287854: Dangling reference in ClassVerifier::verify_class

Changes: https://git.openjdk.java.net/jdk/pull/9075/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=9075&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287854
  Stats: 5 lines in 1 file changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/9075.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/9075/head:pull/9075

PR: https://git.openjdk.java.net/jdk/pull/9075