Standard way to supply hints to branches

[Walter Bright]

I recently learned a syntactical trick on how to do this.

```
if (x) return;
if (y) return;
if (z) return;
hotPath();
```

Rewrite as:

```
do
{
     if (x) break;
     if (y) break;
     if (z) break;
     hotPath();
} while (0);
```

Of course, this will also work:

```
if (x) goto Lreturn;
if (y) goto Lreturn;
if (z) goto Lreturn;
hotPath();
Lreturn:
```