[RISCV] Remove policy and merge operand from unmasked vmsbf/vmsif/vmsof.m. (#94530)

These instructions always update the destination under a tail agnostic
policy.

Author: topperc

llvm/lib/Target/RISCV/RISCVInstrInfoVPseudos.td

@@ -1033,6 +1033,22 @@ class VPseudoUnaryNoMask<DAGOperand RetClass,
   let HasVecPolicyOp = 1;
 }
 
+class VPseudoUnaryNoMaskNoPolicy<DAGOperand RetClass,
+                                 DAGOperand OpClass,
+                                 string Constraint = "",
+                                 int TargetConstraintType = 1> :
+      Pseudo<(outs RetClass:$rd),
+             (ins OpClass:$rs2, AVL:$vl, ixlenimm:$sew), []>,
+      RISCVVPseudo {
+  let mayLoad = 0;
+  let mayStore = 0;
+  let hasSideEffects = 0;
+  let Constraints = Constraint;
+  let TargetOverlapConstraintType = TargetConstraintType;
+  let HasVLOp = 1;
+  let HasSEWOp = 1;
+}
+
 class VPseudoUnaryNoMaskRoundingMode<DAGOperand RetClass,
                                      DAGOperand OpClass,
                                      string Constraint = "",
@@ -2056,7 +2072,7 @@ multiclass VPseudoVSFS_M {
   foreach mti = AllMasks in {
     defvar mx = mti.LMul.MX;
     let VLMul = mti.LMul.value in {
-      def "_M_" # mti.BX : VPseudoUnaryNoMask<VR, VR, constraint>,
+      def "_M_" # mti.BX : VPseudoUnaryNoMaskNoPolicy<VR, VR, constraint>,
                            SchedUnary<"WriteVMSFSV", "ReadVMSFSV", mx,
                                       forceMergeOpRead=true>;
       def "_M_" # mti.BX # "_MASK" : VPseudoUnaryMask<VR, VR, constraint>,
@@ -4078,9 +4094,8 @@ class VPatMaskUnaryNoMask<string intrinsic_name,
                 (mti.Mask VR:$rs2),
                 VLOpFrag)),
                 (!cast<Instruction>(inst#"_M_"#mti.BX)
-                (mti.Mask (IMPLICIT_DEF)),
                 (mti.Mask VR:$rs2),
-                GPR:$vl, mti.Log2SEW, TA_MA)>;
+                GPR:$vl, mti.Log2SEW)>;
 
 class VPatMaskUnaryMask<string intrinsic_name,
                         string inst,