[NFC][SVE] Remove redundant pattern

Author: junparser

llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td

@@ -2276,8 +2276,6 @@ let Predicates = [HasSVE] in {
             (EXTRACT_SUBREG (DUP_ZZI_D ZPR:$vec, sve_elm_idx_extdup_d:$index), dsub)>;
   def : Pat<(f16 (vector_extract (nxv8f16 ZPR:$vec), sve_elm_idx_extdup_h:$index)),
             (EXTRACT_SUBREG (DUP_ZZI_H ZPR:$vec, sve_elm_idx_extdup_h:$index), hsub)>;
-  def : Pat<(f16 (vector_extract (nxv8f16 ZPR:$vec), sve_elm_idx_extdup_h:$index)),
-            (EXTRACT_SUBREG (DUP_ZZI_H ZPR:$vec, sve_elm_idx_extdup_h:$index), hsub)>;
   def : Pat<(f16 (vector_extract (nxv4f16 ZPR:$vec), sve_elm_idx_extdup_s:$index)),
             (EXTRACT_SUBREG (DUP_ZZI_S ZPR:$vec, sve_elm_idx_extdup_s:$index), hsub)>;
   def : Pat<(f16 (vector_extract (nxv2f16 ZPR:$vec), sve_elm_idx_extdup_d:$index)),