hg: amber/amber: adding regression tests

[vicente.romero at oracle.com]

Changeset: 02506a5c9735
Author:    vromero
Date:      2020-02-27 13:49 -0500
URL:       https://hg.openjdk.java.net/amber/amber/rev/02506a5c9735

adding regression tests

+ test/langtools/tools/javac/diags/examples/PermitsCantListDeclaringClass.java
+ test/langtools/tools/javac/diags/examples/PermitsCantListSuperType.java
! test/langtools/tools/javac/sealed/SealedCompilationTests.java