Inlined functions and their original bodies - bloat

[kinke]

The 'bloat' is usually gotten rid of by the linker if really 
unreferenced in the binary being linked.

There's a little trick to make sure the function is *always* 
inlined, across modules too, allowing to suppress the then 
guaranteed unused function symbol - converting it to a function 
literal. See 
https://github.com/ldc-developers/ldc/issues/2968#issuecomment-1628615699.