RFR: 8362276: CLONE (simple fix) - NMT crash in gtest/NMTGtests.java: fatal error: NMT corruption: Block at 0x0000017748307120: header canary broken

[Gerard Ziemski]

Me move the lock to make sure remove_all() is included.

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Commit messages:
 - make sure the lock covers remove_all()

Changes: https://git.openjdk.org/jdk/pull/26324/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26324&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8362276
  Stats: 13 lines in 1 file changed: 7 ins; 5 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26324.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26324/head:pull/26324

PR: https://git.openjdk.org/jdk/pull/26324