RFR: 8281093: JDK 11.0.14 violates Attribute-Value Normalization in the XML specification 1.0

[Ravi Reddy]

While normalizing entity with '\r' , we should be checking if the entity is
external before changing the position and offset.

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Commit messages:
 - 8281093: JDK 11.0.14 violates Attribute-Value Normalization in the XML specification 1.0

Changes: https://git.openjdk.java.net/jdk/pull/7617/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7617&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281093
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7617.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7617/head:pull/7617

PR: https://git.openjdk.java.net/jdk/pull/7617