Reviewed-by: jjg, jfranck

Reviewed-by: jjg, vromero
Contributed-by: maurizio.cimadamore@oracle.com

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

Summary: Add type-checking support for default methods as per Featherweight-Defender document
Reviewed-by: jjg, dlsmith

Summary: Spurious extra call to Attr.checkMethod when method call is unchecked
Reviewed-by: jjg, dlsmith

Summary: Add class to handle inference variables instantiation and associated info
Reviewed-by: jjg, dlsmith

Summary: Inference should fail in 15.12.2.7 when inference variables with 'nulltype' upper bounds are found
Reviewed-by: dlsmith

Summary: unqualified 'this' should not be selected in a qualified super() call in a default constructor
Reviewed-by: jjg

Summary: override clash algorithm is not implemented correctly
Reviewed-by: jjg

Summary: fixed regression with varargs overload resolution that leads javac to crash
Reviewed-by: jjg

Summary: several diagnostic improvements
Reviewed-by: jjg

Reviewed-by: mcimadamore

Summary: synthetic name clash check should not apply to miranda methods
Reviewed-by: jjg
Contributed-by: tomas.zezula@sun.com

Reviewed-by: darcy

Summary: Race condition between symbol completion and attribution of import statements causes NPE when creating intersection type
Reviewed-by: jjg

6920317: package-info.java file has to be specified on the javac cmdline, else it will not be avail.
Reviewed-by: darcy