RFR: 8378354: Faulty assertion in checkInvariants method of ConcurrentHashMap

[cdw200806]

"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:
 - Update ConcurrentHashMap.java

Changes: https://git.openjdk.org/jdk/pull/24612/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24612&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/24612.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24612/head:pull/24612

PR: https://git.openjdk.org/jdk/pull/24612