8075509: List.map should return itself if list is unchanged Summary: Fix List.map to match semantics of old Type.map Reviewed-by: jlahoda

8048838: type inference performance regression Summary: Reduce redundant bounds before attempting to do pairwise lub computation during bound incorporation. Reviewed-by: vromero

8074100: Turn Type.Mapping into a true visitor Summary: replace Type.Mapping with a true visitor in Types Reviewed-by: jlahoda, vromero

8074381: java.lang.AssertionError during compiling Summary: Add extra functional interface check to prevent crash during code generation Reviewed-by: vromero