RFR: 8303213: Avoid AtomicReference in TextComponentPrintable

[Andrey Turbanov]

If CompareAndSwap is not used, then AtomicReference could be replaced with volatile. It simplified code a bit.

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Commit messages:
 - [PATCH] Avoid AtomicReference in TextComponentPrintable

Changes: https://git.openjdk.org/jdk/pull/12018/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12018&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303213
  Stats: 13 lines in 1 file changed: 0 ins; 1 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/12018.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12018/head:pull/12018

PR: https://git.openjdk.org/jdk/pull/12018