Louis Dionne cb347a1106 [libc++] Remove assertion in year_month_day_last::day()
This reverts commit 0c148430cf61, which added an assertion in day().
The Standard doesn't allow day() to crash -- instead it says that the
result is unspecified.

Differential Revision: https://reviews.llvm.org/D70346
2020-06-09 10:46:13 -04:00
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