[RISCV][NFC] Remove useless intrinsic function declare in test of Zbp extension

[Jimerlife]

Summary

Remove useless intrinsic function declare.
It's should be @llvm.riscv.grev.i32 and @llvm.riscv.gorc.i64, not @llvm.riscv.grevi.i32 and @llvm.riscv.gorci.i64.

llvm/test/CodeGen/RISCV/rv64zbp-intrinsic.ll

 ; RV64ZBP-NEXT:    grevw a0, a0, a2
 ; RV64ZBP-NEXT:    ret
   %d = add i32 %a, %b
   %e = and i32 %c, 31
   %tmp = call i32 @llvm.riscv.grev.i32(i32 %d, i32 %e)
   ret i32 %tmp
 }
 
-declare i32 @llvm.riscv.grevi.i32(i32 %a)
-
 define signext i32 @grevi32(i32 signext %a) nounwind {
 ; RV64ZBP-LABEL: grevi32:
 ; RV64ZBP:       # %bb.0:
 ; RV64ZBP-NEXT:    greviw a0, a0, 13
 ; RV64ZBP-NEXT:    ret
   %tmp = call i32 @llvm.riscv.grev.i32(i32 %a, i32 13)
  ret i32 %tmp
 }

 ; RV64ZBP:       # %bb.0:
 ; RV64ZBP-NEXT:    gorc a0, a0, a1
 ; RV64ZBP-NEXT:    ret
   %c = and i64 %b, 63
   %tmp = call i64 @llvm.riscv.gorc.i64(i64 %a, i64 %c)
   ret i64 %tmp
 }
 
-declare i64 @llvm.riscv.gorci.i64(i64 %a)
-
 define i64 @gorci64(i64 %a) nounwind {
 ; RV64ZBP-LABEL: gorci64:
 ; RV64ZBP:       # %bb.0:
 ; RV64ZBP-NEXT:    gorci a0, a0, 13
 ; RV64ZBP-NEXT:    ret
   %tmp = call i64 @llvm.riscv.gorc.i64(i64 %a, i64 13)
  ret i64 %tmp
 }