Let's take instruct vaddI_vi in riscv_v.ad as an example.

```
// vector-immediate add (unpredicated)

instruct vaddI_vi(vReg dst, vReg src1, immI5 con) %{
  match(Set dst (AddVB src1 (Replicate con)));
  match(Set dst (AddVS src1 (Replicate con)));
  match(Set dst (AddVI src1 (Replicate con)));
  format %{ "vaddI_vi $dst, $src1, $con" %} <====================================
  ins_encode %{
    BasicType bt = Matcher::vector_element_basic_type(this);
    __ vsetvli_helper(bt, Matcher::vector_length(this));
    __ vadd_vi(as_VectorRegister($dst$$reg),
               as_VectorRegister($src1$$reg),
               $con$$constant);
  %}
  ins_pipe(pipe_slow);
%}
```

This instruct matches the B, S, and I variants.
But we use vaddI_vi as the opcode for for these variants in PrintOptoAssembly output.
This could be misleading as the I suffix may indicate the I variant to people.
Consider removing the I suffix and renaming this to others like vadd_vi.