hg: amber/amber: refactoring: removing outdated code, adding diagnostics

[vicente.romero at oracle.com]

Changeset: 15489d82799e
Author:    vromero
Date:      2020-02-14 17:17 -0500
URL:       https://hg.openjdk.java.net/amber/amber/rev/15489d82799e

refactoring: removing outdated code, adding diagnostics

! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Enter.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties
! test/langtools/tools/javac/diags/examples/CantInheritFromSealed.java
+ test/langtools/tools/javac/diags/examples/DuplicateTypeInPermits.java
+ test/langtools/tools/javac/diags/examples/NonSealedWithNoSealedSuper.java
+ test/langtools/tools/javac/diags/examples/PermitsInNoSealedClass.java
+ test/langtools/tools/javac/diags/examples/SealedMustHaveSubtypes.java
+ test/langtools/tools/javac/diags/examples/SubtypeDoesntExtendSealed.java
+ test/langtools/tools/javac/diags/examples/TypeVarInPermits.java