[RISCV] Fix predicates on zvbb patterns

[luke]

Summary

The zvbb extension predicate was getting overwritten by the vtype predicates.
There's no change in the tests though because the ISD nodes were getting
expanded before instruction selection.

[craig.topper]

LGTM

llvm/lib/Target/RISCV/RISCVInstrInfoZvk.td

 defm PseudoVCPOP : VPseudoUnaryV_V;
 
 //===----------------------------------------------------------------------===//
 // SDNode patterns
 //===----------------------------------------------------------------------===//
 
 multiclass VPatUnarySDNode_V<SDPatternOperator op, string instruction_name> {
   foreach vti = AllIntegerVectors in {
-    let Predicates = GetVTypePredicates<vti>.Predicates in {
+    let Predicates = !listconcat([HasStdExtZvbb],
+                                 GetVTypePredicates<vti>.Predicates) in {
       def : Pat<(vti.Vector (op (vti.Vector vti.RegClass:$rs1))),
                 (!cast<Instruction>(instruction_name#"_V_"#vti.LMul.MX)
                    (vti.Vector (IMPLICIT_DEF)),
                    vti.RegClass:$rs1,
                    vti.AVL, vti.Log2SEW, TA_MA)>;
     }
   }
 }
 
-let Predicates = [HasStdExtZvbb] in {
-  defm : VPatUnarySDNode_V<bitreverse, "PseudoVBREV">;
-  defm : VPatUnarySDNode_V<bswap, "PseudoVREV8">;
-  defm : VPatUnarySDNode_V<ctlz, "PseudoVCLZ">;
-  defm : VPatUnarySDNode_V<cttz, "PseudoVCTZ">;
-  defm : VPatUnarySDNode_V<ctpop, "PseudoVCPOP">;
-}