Macro declare_combined_early_lint_pass

macro_rules! declare_combined_early_lint_pass {
    ([$v:vis $name:ident, [$($pass:ident: $constructor:expr,)*]], $methods:tt) => { ... };
}

Combines multiple lints passes into a single lint pass, at compile time, for maximum speed. Each check_foo method in $methods within this pass simply calls check_foo once per $pass. Compare with EarlyLintPassObjects, which is similar, but combines lint passes at runtime.