[jdk17] RFR: 8265073: XML transformation and indentation when using xml:space

[Joe Wang]

The issue was that the attribute was processed before the variable was set (e.g. m_preserveSpaces.push). Reversing the order fixed it.

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Commit messages:
 - 8265073: XML transformation and indentation when using xml:space

Changes: https://git.openjdk.java.net/jdk17/pull/89/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17&pr=89&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265073
  Stats: 59 lines in 2 files changed: 51 ins; 6 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk17/pull/89.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17 pull/89/head:pull/89

PR: https://git.openjdk.java.net/jdk17/pull/89