[jdk17u-dev] RFR: 8296818: Enhance JMH tests java/security/Signatures.java

[Goetz Lindenmaier]

I backport this for parity with 17.0.15-oracle.

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Commit messages:
 - Backport 8752bb4be8ff71b57ddc262fde73fb3102a1a179

Changes: https://git.openjdk.org/jdk17u-dev/pull/3190/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3190&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296818
  Stats: 147 lines in 1 file changed: 115 ins; 16 del; 16 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3190.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3190/head:pull/3190

PR: https://git.openjdk.org/jdk17u-dev/pull/3190