Remove dummy value locals for function ptr calls

[sapir]

This makes the generated code cleaner so it's easier to debug.

[GuillaumeGomez]

Nice improvement!

[antoyo]

I believe I had a good reason to do this.
You can see where I did this here.

I'm not sure I remember correctly, but this was certainly for debugging reasons, possibly to clearly indicate that this value is never used because I might have thought otherwise at the time.

This is possibly not needed anymore, though.

[antoyo]

Thanks for your contribution!