8068995: Cleanup method reference lookup code
Summary: Simplify method reference code lookup and generate better/more uniform diagnostics
Reviewed-by: vromero

8026231: Look at 'static' flag when checking method references
Reviewed-by: jjg, dlsmith

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

8008537: Missing method reference lookup error when unbound search finds a static method
Summary: Static-ness check should be applied after member reference resolution
Reviewed-by: jjg

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