8075793: Source incompatibility for inference using -source 7
Summary: In pre-8 sources, avoid capture variables as inference bounds, consistent with old javac behavior
Reviewed-by: vromero, mcimadamore

8039214: Inference should not map capture variables to their upper bounds
Summary: Update to Types.containsType; related adjustment to most-specific test
Reviewed-by: mcimadamore, vromero