git: openjdk/amber: sealed-types: adding more regression tests, bug fixing, etc

[Vicente Romero]

Changeset: 5db4b8b7
Author:    Vicente Romero <vicente.romero at oracle.com>
Date:      2020-05-15 15:39:57 +0000
URL:       https://git.openjdk.java.net/amber/commit/5db4b8b7

adding more regression tests, bug fixing, etc

! src/java.compiler/share/classes/javax/lang/model/SourceVersion.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavacParser.java
! test/langtools/tools/javac/parser/JavacParserTest.java
! test/langtools/tools/javac/sealed/SealedCompilationTests.java