[RISCV] Remove untested Zvfbfmin isel patterns (llvm#164111)

These were added with the Zvfbfa instrinsics but aren't tested. We
should probably have these patterns but they should be applicable to
Zvfbfmin and Zvbfa and would need to be tested.

Author: topperc

llvm/lib/Target/RISCV/RISCVInstrInfoZvfbf.td

@@ -438,43 +438,6 @@ let Predicates = [HasStdExtZvfbfmin] in {
                   FRM_DYN,
                   fvti.AVL, fvti.Log2SEW, TA_MA)>;
   }
-
-  foreach fvti = AllBF16Vectors in {
-    defvar ivti = GetIntVTypeInfo<fvti>.Vti;
-
-    def : Pat<(fvti.Vector (vselect (fvti.Mask VMV0:$vm),
-                                    (SplatFPOp (SelectScalarFPAsInt (XLenVT GPR:$imm))),
-                                    fvti.RegClass:$rs2)),
-              (!cast<Instruction>("PseudoVMERGE_VXM_"#fvti.LMul.MX)
-                   (fvti.Vector (IMPLICIT_DEF)),
-                   fvti.RegClass:$rs2, GPR:$imm, (fvti.Mask VMV0:$vm), fvti.AVL, fvti.Log2SEW)>;
-
-    def : Pat<(fvti.Vector (vselect (fvti.Mask VMV0:$vm),
-                                    (SplatFPOp (fvti.Scalar fpimm0)),
-                                    fvti.RegClass:$rs2)),
-              (!cast<Instruction>("PseudoVMERGE_VIM_"#fvti.LMul.MX)
-                   (fvti.Vector (IMPLICIT_DEF)),
-                   fvti.RegClass:$rs2, 0, (fvti.Mask VMV0:$vm), fvti.AVL, fvti.Log2SEW)>;
-
-    def : Pat<(fvti.Vector (riscv_vmerge_vl (fvti.Mask VMV0:$vm),
-                                            (SplatFPOp (SelectScalarFPAsInt (XLenVT GPR:$imm))),
-                                            fvti.RegClass:$rs2,
-                                            fvti.RegClass:$passthru,
-                                            VLOpFrag)),
-              (!cast<Instruction>("PseudoVMERGE_VXM_"#fvti.LMul.MX)
-                   fvti.RegClass:$passthru, fvti.RegClass:$rs2, GPR:$imm, (fvti.Mask VMV0:$vm),
-                   GPR:$vl, fvti.Log2SEW)>;
-
-
-    def : Pat<(fvti.Vector (riscv_vmerge_vl (fvti.Mask VMV0:$vm),
-                                            (SplatFPOp (fvti.Scalar fpimm0)),
-                                            fvti.RegClass:$rs2,
-                                            fvti.RegClass:$passthru,
-                                            VLOpFrag)),
-              (!cast<Instruction>("PseudoVMERGE_VIM_"#fvti.LMul.MX)
-                   fvti.RegClass:$passthru, fvti.RegClass:$rs2, 0, (fvti.Mask VMV0:$vm),
-                   GPR:$vl, fvti.Log2SEW)>;
-  }
 }
 
 let Predicates = [HasStdExtZvfbfwma] in {