Range patterns must not evaluate endpat until the range starts matching

The below awk script:

```awk
a++ == 2, a++ == 5
```

with this input:

```
1
2
3
4
5
6
7
8
9
10
```

should print:

```
3
4
5
```

But Jawk produces:

```
2
3
```

because it executes both *begpat* and *endpat* for each record.

The tuples must be updated to reflect this.
