When doing a function call, if the return type requires comptime, the
function is analyzed as an inline/comptime call.

There is an important TODO here. I will reproduce the comment from this
commit:

> In the case of a comptime/inline function call of a generic function,
> the function return type needs to be the resolved return type based on
> the function parameter type expressions being evaluated with comptime arguments
> passed in. Otherwise, it ends up being .generic_poison and failing the
> comptime/inline function call analysis.