RFR: 8344327: SM cleanup in jdk.unsupported ReflectionFactory

[Roger Riggs]

This cleanup of the use of SecurityManager is in the jdk.unsupported module.
Removed the permission check to call getReflectionFactory().

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Commit messages:
 - 8344327: SM cleanup in jdk.unsupported ReflectionFactory

Changes: https://git.openjdk.org/jdk/pull/22158/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22158&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344327
  Stats: 31 lines in 1 file changed: 0 ins; 28 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/22158.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22158/head:pull/22158

PR: https://git.openjdk.org/jdk/pull/22158