RFR: 8364226: Better ECDSASignature Memory Management

[Kevin Driver]

Enhance the memory management/cleanup for `ECDSASignature`.

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Commit messages:
 - Merge remote-tracking branch 'origin/master' into 8364226
 - JDK-8364226: better memory management/cleanup in ECDSASignature

Changes: https://git.openjdk.org/jdk/pull/26516/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26516&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364226
  Stats: 18 lines in 1 file changed: 13 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/26516.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26516/head:pull/26516

PR: https://git.openjdk.org/jdk/pull/26516