8081271: NPE while compiling a program with erroneous use of constructor reference expressions
Summary: Missing enclosing instance error should not be swallowed when attributing constructor reference expressions.
Reviewed-by: mcimadamore, vromero

8075184: javac is mistakenly considering an missing enclosing instance error as an overload error
Reviewed-by: mcimadamore

8016177: structural most specific and stuckness
Reviewed-by: jjg, vromero
Contributed-by: maurizio.cimadamore@oracle.com

8003280: Add lambda tests
Summary: Turn on lambda expression, method reference and default method support
Reviewed-by: jjg