[jdk15u-dev] RFR: 8287076: Document.normalizeDocument() produces different results

[Yuri Nesterenko]

backporting for parity with LTS releases.
Clean backport with only copyright difference. jaxp and jdk/java/xml tests run OK.

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Commit messages:
 - Backport 1f9521e6cb2f701f8712b4ec941ff1dbb45dad4e

Changes: https://git.openjdk.org/jdk15u-dev/pull/313/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk15u-dev&pr=313&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287076
  Stats: 72 lines in 4 files changed: 52 ins; 3 del; 17 mod
  Patch: https://git.openjdk.org/jdk15u-dev/pull/313.diff
  Fetch: git fetch https://git.openjdk.org/jdk15u-dev pull/313/head:pull/313

PR: https://git.openjdk.org/jdk15u-dev/pull/313