hg: jdk/submit: 8222378: Provide mechanism to query preview feature status for annotation processors

[joe.darcy at oracle.com]

Changeset: bdbfa0115fc6
Author:    darcy
Date:      2019-04-15 15:44 -0700
URL:       http://hg.openjdk.java.net/jdk/submit/rev/bdbfa0115fc6

8222378: Provide mechanism to query preview feature status for annotation processors
Reviewed-by: jjg

! src/java.compiler/share/classes/javax/annotation/processing/ProcessingEnvironment.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/processing/JavacProcessingEnvironment.java
+ test/langtools/tools/javac/processing/environment/TestPreviewEnabled.java