Perhaps they were a corrupted form of Ents? Since Melkor could take things that were made and twist them to his whim. Maybe they were a more powerful form of trolls? The trolls in "The Hobbit" turned back into stone with the dawn. Melkor might have made stone giants stronger, but dumber, so they wouldn't turn into solid stone.
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The Moon is Rising!
Oh hey, I'm a wight now. WORSHIP ME IN ALL MY WIGHTNESS!!! MUAHAHAHA!!
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