[RISCV] Remove HasDummyMask from tablegen files.

This isn't needed after D152050.

Reviewed By: reames

Differential Revision: https://reviews.llvm.org/D152218

llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.h

@@ -64,12 +64,8 @@ enum {
   VLMulShift = ConstraintShift + 3,
   VLMulMask = 0b111 << VLMulShift,
 
-  // Do we need to add a dummy mask op when converting RVV Pseudo to MCInst.
-  HasDummyMaskOpShift = VLMulShift + 3,
-  HasDummyMaskOpMask = 1 << HasDummyMaskOpShift,
-
   // Force a tail agnostic policy even this instruction has a tied destination.
-  ForceTailAgnosticShift = HasDummyMaskOpShift + 1,
+  ForceTailAgnosticShift = VLMulShift + 3,
   ForceTailAgnosticMask = 1 << ForceTailAgnosticShift,
 
   // Does this instruction have a merge operand that must be removed when

llvm/lib/Target/RISCV/RISCVInstrFormats.td

@@ -187,36 +187,33 @@ class RVInst<dag outs, dag ins, string opcodestr, string argstr,
   bits<3> VLMul = 0;
   let TSFlags{10-8} = VLMul;
 
-  bit HasDummyMask = 0;
-  let TSFlags{11} = HasDummyMask;
-
   bit ForceTailAgnostic = false;
-  let TSFlags{12} = ForceTailAgnostic;
+  let TSFlags{11} = ForceTailAgnostic;
 
   bit HasMergeOp = 0;
-  let TSFlags{13} = HasMergeOp;
+  let TSFlags{12} = HasMergeOp;
 
   bit HasSEWOp = 0;
-  let TSFlags{14} = HasSEWOp;
+  let TSFlags{13} = HasSEWOp;
 
   bit HasVLOp = 0;
-  let TSFlags{15} = HasVLOp;
+  let TSFlags{14} = HasVLOp;
 
   bit HasVecPolicyOp = 0;
-  let TSFlags{16} = HasVecPolicyOp;
+  let TSFlags{15} = HasVecPolicyOp;
 
   bit IsRVVWideningReduction = 0;
-  let TSFlags{17} = IsRVVWideningReduction;
+  let TSFlags{16} = IsRVVWideningReduction;
 
   bit UsesMaskPolicy = 0;
-  let TSFlags{18} = UsesMaskPolicy;
+  let TSFlags{17} = UsesMaskPolicy;
 
   // Indicates that the result can be considered sign extended from bit 31. Some
   // instructions with this flag aren't W instructions, but are either sign
   // extended from a smaller size, always outputs a small integer, or put zeros
   // in bits 63:31. Used by the SExtWRemoval pass.
   bit IsSignExtendingOpW = 0;
-  let TSFlags{19} = IsSignExtendingOpW;
+  let TSFlags{18} = IsSignExtendingOpW;
 }
 
 // Pseudo instructions