RFR: 8302822: Method/Field/Constructor/RecordComponent::getGenericInfo() is not thread safe

[liach]

8302822: Method/Field/Constructor/RecordComponent::getGenericInfo() is not thread safe

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Commit messages:
 - 8302822: Method/Field/Constructor/RecordComponent::getGenericInfo() is not thread safe

Changes: https://git.openjdk.org/jdk/pull/12643/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12643&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302822
  Stats: 12 lines in 4 files changed: 8 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/12643.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12643/head:pull/12643

PR: https://git.openjdk.org/jdk/pull/12643