Should the the different WATF formats have different AST representations

[ColinEberhardt]

These two functions are equivalent -

operations written in a 'stack' form:

  (func $add (param f32) (param f32) (result f32)
   (get_local 0)
   (get_local 1)
   (f32.add)
  )

and in a 'function call' form:

  (func $add (param f32) (param f32) (result f32)
   (f32.add
     (get_local 0)
     (get_local 1)
   )
  )

However, our interpreter has to treat each differently. Here's an example that allows unary operations to use the 'function call' form:

https://github.com/xtuc/js-webassembly-interpreter/pull/116/commits/ca3b3a346ea61f930306f33b162da357c69259ed

I think it would be better if the interpreter didn't have to handle this. Should these two forms result in the same AST?