bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations?

[Stefan Monnier]

> Fortunately modern compilers generate SSE code by default, only passing
> return values on the x87 stack as per the x86 ABI (which causes no
> harm). This reduces an already tiny risk to nil. We could add an elaborate
> configure or run-time test and admonishments to the installation
> instructions but frankly we have better use of our time. I suggest we
> replace byte-opt--portable-numberp with numberp (or nothing at all,
> depending on where it occurs) and be done with it.

Agreed,


        Stefan