Witness that some c2 instructions use the inappropriate ins_pipe, e.g.:

```
instruct MoveI2F_stack_reg(fRegF dst, stackSlotI src) %{

  match(Set dst (MoveI2F src));

  effect(DEF dst, USE src);

  ins_cost(LOAD_COST);

  format %{ "flw $dst, $src\t#@MoveI2F_stack_reg" %}

  ins_encode %{
    __ flw(as_FloatRegister($dst$$reg), Address(sp, $src$$disp));
  %}

  ins_pipe(pipe_class_memory);

%}
```

We can use the more accurate pipe_class `fp_load_mem_s` instead.