TypeInfo in struct ABI

[rikki cattermole]

TypeInfo is used by a precise GC to determine how to (if it will need 
to) scan memory that is allocated.

But this can be gained by something like typeid(T).

So you should be able to remove the argument if its not used by anything 
if you are templating on the type.

auto blkInf = GC.qalloc(size, flags, typeid(Type));

https://github.com/dlang/druntime/blob/9d99b1ccd90d1e66c31e27cc71b8a266612aa14a/src/rt/lifetime.d#L1116