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Add support for _mm256_min_epu16 #597

Job	Run time
Dub Tests (windows-latest, dmd-latest)	38s
Dub Tests (windows-latest, dmd-2.097.0)	39s
Dub Tests (windows-latest, dmd-2.096.1)	32s
Dub Tests (windows-latest, dmd-2.095.1)	33s
Dub Tests (windows-latest, dmd-2.094.2)	33s
Dub Tests (windows-latest, ldc-latest)	53s
Dub Tests (windows-latest, ldc-1.33.0)	54s
Dub Tests (windows-latest, ldc-1.32.2)	53s
Dub Tests (windows-latest, ldc-1.31.0)	58s
Dub Tests (windows-latest, ldc-1.30.0)	59s
Dub Tests (windows-latest, ldc-1.29.0)	1m 0s
Dub Tests (windows-latest, ldc-1.28.1)	55s
Dub Tests (windows-latest, ldc-1.27.1)	40s
Dub Tests (windows-latest, ldc-1.26.0)	44s
Dub Tests (windows-latest, ldc-1.25.1)	41s
Dub Tests (windows-latest, ldc-1.24.0)	46s
	12m 18s

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