* Use macros for more division/array checks This commit moves over more array accesses to the `i!` macro to avoid bounds checks when debug assertions are disabled. This is surfaced from rust-lang/compiler-builtins#360 where recent changes in codegen units has caused some bounds checks to not get elided in release mode. This also adds a `div!` macro to work around rust-lang/rust#72751. * Don't test/bench our shim crate It's not intended to run all our tests