[PATCH] D56494: Implement the `sys_time` portions of the C++20 calendaring stuff

[Marshall Clow via Phabricator]

mclow.lists created this revision.
mclow.lists added reviewers: EricWF, ldionne.

Add the types `sys_time`, `sys_days` and `sys_seconds`, and add support for them to all the classes that need it.

Un-XFAIL a bunch of tests now that they should pass.


https://reviews.llvm.org/D56494

Files:
  include/chrono
  test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/ctor.sys_days.pass.cpp
  test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.sys_days.pass.cpp
  test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.year_month_day_last.pass.cpp
  test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ok.pass.cpp
  test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/op.sys_days.pass.cpp
  test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/day.pass.cpp
  test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/op_sys_days.pass.cpp
  test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ctor.sys_days.pass.cpp
  test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ctor.year_month_day_last.pass.cpp
  test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/op.sys_days.pass.cpp
  test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/op_sys_days.pass.cpp
  test/std/utilities/time/time.clock/time.clock.system/sys.time.types.pass.cpp

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