[SDAG] Support expanding `FSINCOS` to vector library calls (#114039) This shares most of its code with the scalar sincos expansion. It allows expanding vector FSINCOS nodes to a library call from the specified `-vector-library`. The upside of this is it will mean the vectorizer only needs to handle the sincos intrinsic, which has no memory effects, and this can handle lowering the intrinsic to a call that takes output pointers.
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