Summary: to use new InternalError constructor with cause chainning
Reviewed-by: alanb, ksrini, xuelei, neugens
Contributed-by: sebastian.sickelmann@gmx.de

6560965: [Fmt-Da] defaultCenturyStart In SimpleDateFormat should be protected
6560980: [Fmt-Da] DateFormatSymbols.cacheLookup doesn't update cache correctly.
Reviewed-by: naoto, peytoia

Reviewed-by: peytoia

6549953: (cal) WEEK_OF_YEAR and DAY_OF_YEAR calculation problems around Gregorian cutover
Reviewed-by: peytoia

Reviewed-by: okutsu

Reviewed-by: darcy, weijun