Lint for large stack allocated values

[huonw]

It seems feasible to warn when huge data-structures are going to be stack-allocated, leading to overflows and segfaults. (e.g. http://stackoverflow.com/questions/16601160/multidimensional-vectors-in-rust-segfaulting)

[thestinger]

This is just a compiler bug, we shouldn't ever be crashing on huge data structures on the stack. The worst-case scenario should be out-of-memory or the current 1GiB stack limit since Rust can grow the stack.