Inline the hot call

From: https://nnethercote.github.io/perf-book/inlining.html#harder-cases

Sometimes you have a function that is large and has multiple call sites, but only one call site is hot. You would like to inline the hot call site for speed, but not inline the cold call sites to avoid unnecessary code bloat. The way to handle this is to split the function always-inlined and never-inlined variants, with the latter calling the former.

For example, this function:

fn my_function() {
    one();
    two();
    three();
}

Would become these two functions:

// Use this at the hot call site.
#[inline(always)]
fn inlined_my_function() {
    one();
    two();
    three();
}

// Use this at the cold call sites.
#[inline(never)]
fn uninlined_my_function() {
    inlined_my_function();
}