8144941: test/tools/javac/processing/TestMultipleErrors.java should have /nodynamiccopyright
Summary: Removed copyright notice and added /nodynamiccopyright.
Reviewed-by: jjg

8076543: Add @modules as needed to the langtools tests
Reviewed-by: jjg, shurailine

8066843: Messager.printMessage cannot print multiple errors for same source position
Summary: Using a DiagnosticFlag to mark diagnostics that should be always printed even if multiple of them have the same source position.
Reviewed-by: darcy, jjg, mcimadamore