likely_polyfill 1.0.0

cold_path, likely, and unlikely for non-nightly Rust
Documentation 
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As a workaround to their [stabilization in the standard library](https://github.com/rust-lang/rust/issues/136873) remaining perma-open,
this crate provides the `cold_path`, `likely`, and `unlikely` hints
built on the `#[cold]` annotation as copied and pasted from the standard library source.

# Licensing

MIT or Apache-2.0 (since code was copied from the standard library)

# Why not a pre-existing crate?

There are other pre-existing crates for this purpose, but they use different
implementation patterns, and I tested this pattern already.

# Why not just `#cold`?

I saw a case where

```rust
if cond1 {
    if cond2 {
        // ..
        break;
    }
}
cold_path();
```

seemed to optimize differently than

```rust
if likely(cond1) {
    if likely(cond2) {
        // ..
        break;
    }
}
```

so it probably makes sense to experiment.