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afdb2ef2ed
This adds some default costs for fp extends and truncates, generally costing them as 1 per lane. If the type is not legal then the cost will include a call to an __aeabi_ function. Some NEON code is also adjusted to make sure it applies to the expected types, now that fp16 is a more common thing. Differential Revision: https://reviews.llvm.org/D82458
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