Cover HijrahDate with tests.

Bug: 182165762
Test: atest libcore.java.time.chrono.HijrahDateTest
Change-Id: I39c5d76646106c50508aaba09b6b23f99af5bbb1
Merged-In: I39c5d76646106c50508aaba09b6b23f99af5bbb1
(cherry picked from commit 8e0b311f20a9874435a6c548de863ec7789d766b)
1 file changed