RFR: 8303213: Avoid AtomicReference in TextComponentPrintable [v2]

[Andrey Turbanov]

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

Andrey Turbanov has updated the pull request incrementally with one additional commit since the last revision:

  8303213: Avoid AtomicReference in TextComponentPrintable
  
  read volatile field only once

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12018/files
  - new: https://git.openjdk.org/jdk/pull/12018/files/b7224447..b9e7bd7a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12018&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12018&range=00-01

  Stats: 8 lines in 1 file changed: 6 ins; 1 del; 1 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