Assert that diassembly is "small"
Assert that diassembly is "small"

There's a lot of trickery in this crate which expands to a lot of code, so in
addition to asserting that we find the right instruction, let's assert we find
a small function as well (as these should all be just one or so instructions
anyway).

rust-lang/stdarch,rust-lang/stdarch,rust-lang/stdarch,rust-lang/stdarch,rust-lang/stdarch