[RISCV] Remove untested Zvfbfmin isel patterns

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

@@ -475,20 +475,6 @@ let Predicates = [HasStdExtZvfbfmin] in {
                    fvti.RegClass:$rs2, fvti.RegClass:$rs1, (fvti.Mask VMV0:$vm),
                    fvti.AVL, fvti.Log2SEW)>;
 
-    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 (vselect (fvti.Mask VMV0:$vm),
                                     (SplatFPOp fvti.ScalarRegClass:$rs1),
                                     fvti.RegClass:$rs2)),
@@ -507,25 +493,6 @@ let Predicates = [HasStdExtZvfbfmin] in {
                    fvti.RegClass:$passthru, fvti.RegClass:$rs2, fvti.RegClass:$rs1, (fvti.Mask VMV0:$vm),
                    GPR:$vl, 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)>;
-
     def : Pat<(fvti.Vector (riscv_vmerge_vl (fvti.Mask VMV0:$vm),
                                             (SplatFPOp fvti.ScalarRegClass:$rs1),
                                             fvti.RegClass:$rs2,