[RISCV] Fold vfmv.f.s of f16 into load from stack (#110214) After #110144, we can finish off #110129 and fold f16 vfmv.f.s into a flh. vfmv.f.s is only available for f16 with zvfh, which in turn requires zfhmin so we can use flh. bf16 has no vfmv.f.s so the extract_vector_elt is lowered as an integer in #110144, and gets the existing integer vmv.x.s fold.
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