hg: jdk/sandbox: 8251921: Expand default constructor warning to cover more cases

[chris.hegarty at oracle.com]

Changeset: 95629ba5595b
Author:    darcy
Date:      2020-08-27 13:01 -0700
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/95629ba5595b

8251921: Expand default constructor warning to cover more cases
Reviewed-by: jjg, abuckley

! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Check.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/javac.properties
! test/langtools/tools/javac/warnings/DefaultCtor/DefaultCtorWarningToolBox.java