5045147: Prevent insertion of null Key into empty TreeMap (and null element into TreeSet) when no Comparator is used. Prevent insertion of key of incorrect type into empty TreeMap and incorrect type element into TreeSet and incorrect type when Comparator is used. Reviewed-by: alanb, dl, mduigou

^build/
^dist/
/nbproject/private/
^src/share/tools/hsdis/build/
^src/share/tools/IdealGraphVisualizer/[a-zA-Z0-9]*/build/
^src/share/tools/IdealGraphVisualizer/build/
^src/share/tools/IdealGraphVisualizer/dist/