[CostModel] Handle vector struct results and cost `llvm.sincos` (#123210) This patch updates the cost model to cost intrinsics that return multiple values (in structs) correctly. Previously, the cost model only thought intrinsics that return `VectorType` need scalarizing, which meant it cost intrinsics that return multiple vectors (that need scalarizing) way too cheap (giving it the cost of a single function call). This patch also adds a custom cost for llvm.sincos when a vector function library is available, as certain VFs can be expanded (later in code gen) to a vector function, reducing the cost to a single call (+ the possible loads from the vector function returns values via output pointers).
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