RFR: 8286266: [macos] Voice over moving JTable column to be the first column JVM crashes

[Alexander Zuev]

Moving cache invalidation from the clearCache method to a createRowWithIndex method
eliminating race condition that causes crash. Now clearCache just notifies that cache
is invalid and should be regenerated next time it is being accessed.

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Commit messages:
 - 8286266: [macos] Voice over moving JTable column to be the first column JVM crashes

Changes: https://git.openjdk.java.net/jdk/pull/8636/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8636&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8286266
  Stats: 19 lines in 2 files changed: 10 ins; 4 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8636.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8636/head:pull/8636

PR: https://git.openjdk.java.net/jdk/pull/8636