8342934: TYPE_USE annotations printed with error causing "," in toString output

[cushon]

This backport of JDK-8342934 fixes a bug in TypeMirror#toString output when printing types with multiple type annotations.

TypeMirror#toString is specified to return a string that is "suitable for representing this type in source code". This fix causes types with multiple annotations to be printed with a space separated list of annotations, instead of using ,, which would not be valid Java source. For example java.lang.@A @B String instead of java.lang.@A,@B String.

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Progress

• Change must not contain extraneous whitespace
• JDK-8342934 needs maintainer approval
• Commit message must refer to an issue

Integration blocker

 ⚠️ Dependency #4242 must be integrated first

Issue

• JDK-8342934: TYPE_USE annotations printed with error causing "," in toString output (Bug - P4)

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[bridgekeeper]

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[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (50bfedbe)