Re: Fortran: fix another function argtypes bug for ppc

[Thomas Koenig via Gcc-patches]

Hi FX,

The patch is regtested on x86_64-apple-darwin19.
I also tested it on aarch64-apple-darwin20, where it fixes wrong code issues in 
several testcases.

OK (you can also put in a quick FIXME there).

Best regards

        Thomas