Add vectorization in elementwise_util (not working yet)

[swolchok]

this works with op_mul, which is vectorized-friendly, but doesn't work
when we roll out to pattern.h because those ops will not work with
Vectorized yet. See TODO in elementwise_util.h

[swolchok]

Stack from ghstack (oldest at bottom):

• -> Add vectorization in elementwise_util (not working yet) #9432
• BroadcastIndexesRange: leading 1s don't require true broadcasting #9431
• RFC: Specialize for non-mixed-dtype in elementwise_util #9388
• Refactor elementwise_util: create variants with out_dtypes in template argument list #9387
• Implement unary_ufunc functions using elementwise_util #9386
• elementwise_util: don't cast the result of compute_fun back to the common type #9385
• Make PyTorch headers available in optimized_portable_kernels, define ET_USE_PYTORCH_HEADERS #9384

[pytorch-bot]

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❌ 69 New Failures

As of commit 2d19e75 with merge base a5d64cf ():

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