RFR: 8378354: Faulty assertion in checkInvariants method of ConcurrentHashMap

[cdw200806]

Raise a new PR. for https://github.com/openjdk/jdk/pull/24612 is too old.

"In Red-Black Trees, a red node cannot have any red children; this rule is violated even if only one child is red, not just when both children are red."

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Commit messages:
 - Fix red-black tree invariant check in ConcurrentHashMap

Changes: https://git.openjdk.org/jdk/pull/29857/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29857&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8378354
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/29857.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29857/head:pull/29857

PR: https://git.openjdk.org/jdk/pull/29857