[CostModel] Sink intrinsic costs to base TTI.
Recommitting part of "[CostModel] Unify Intrinsic Costs." de71def3 Move the switch statement from TTImpl::getIntrinsicCost to TTI::getIntrinsicInstrCost. This enables BasicTTI to understand more 'free' intrinsics instead of defaulting to a cost of 1. Differential Revision: https://reviews.llvm.org/D80012
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