Missing usage of objc_msgSend_fpret

[dkocher]

https://developer.apple.com/documentation/objectivec/1456697-objc_msgsend_fpret

On the i386 platform, the ABI for functions returning a floating-point value is incompatible with that for functions returning an integral type. On the i386 platform, therefore, you must use objc_msgSend_fpret for functions that for functions returning non-integral type. For float or long double return types, cast the function to an appropriate function pointer type first. This function is not used on the PPC or PPC64 platforms.

[dkocher]

Does not look like we will ever need to implement this as i386 is almost nowhere supported anymore.