[SLP] Use the correct calling convention for vector math routines (#180759) When vectorising calls to math intrinsics such as llvm.pow we correctly detect and generate calls to the corresponding vector math variant. However, we don't pick up and use the calling convention for the vector math function. This matters for veclibs such as ArmPL where the aarch64_vector_pcs calling convention can improve codegen by reducing the number of registers that need saving across calls.
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