hg: amber/amber: implement ClassTree.getPermitsClause and scanners

[jonathan.gibbons at oracle.com]

Changeset: 379c97f704d8
Author:    jjg
Date:      2019-07-31 13:41 -0700
URL:       https://hg.openjdk.java.net/amber/amber/rev/379c97f704d8

implement ClassTree.getPermitsClause and scanners

! src/jdk.compiler/share/classes/com/sun/source/tree/ClassTree.java
! src/jdk.compiler/share/classes/com/sun/source/util/TreeScanner.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/tree/JCTree.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/tree/TreeScanner.java