[jdk16u] RFR: 8261209: isStandalone property: remove dependency on pretty-print

[Kiran Sidhartha Ravikumar]

Backport JDK-8261209 to 16u repo. Patch applies clean and passed regression

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Commit messages:
 - Backport 7c565f8b377bc4b61fa907b68d8c23d489df1cdc

Changes: https://git.openjdk.java.net/jdk16u/pull/29/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16u&pr=29&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261209
  Stats: 36 lines in 3 files changed: 18 ins; 2 del; 16 mod
  Patch: https://git.openjdk.java.net/jdk16u/pull/29.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16u pull/29/head:pull/29

PR: https://git.openjdk.java.net/jdk16u/pull/29