[primTorch] added ref for nn.functional.glu

[fdrocha]

Stack from ghstack (oldest at bottom):

• #82819
• -> #82214
• #82817

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[fdrocha]

Ok, now I think it really is ready. I added the type promotion logic to the cuda kernel. While doing it I noticed that sinc kernel was also missing it so I added it there too. @ngimel and @Lezcano could you PTAL?

[fdrocha]

@pytorchbot merge -g

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