RFR: JDK-8260858: Implementation specific property xsltcIsStandalone for XSLTC Serializer

[Lance Andersen]

On Sat, 13 Feb 2021 00:16:50 GMT, Joe Wang <joehw at openjdk.org> wrote:

> Adds a property similar to 'isStandalone' in JDK-8249867.
> 
> Please note that the test received an auto-format. The material changes were the two tests marked with bug id 8260858 and related data and methods.

Marked as reviewed by lancea (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/2559