Improve accuracy of ext_stmt emits during pipe operations

We need to emit the EXT_STMT opcode before we compile the call, so that we
attach the line number of where the right hand pipe operator starts.

We also do not need to reset the line number anymore.

The following code shows where these EXT_STMTs are introduced.

```
<?php
/* EXT_STMT */ $myString = "<Hello World>";
$result = /* EXT_STMT */ $myString

    |> /* EXT_STMT(!0:$myString) */ \htmlentities(...)

    |>
		/* EXT_STMT($4) */ \str_split(...)

    |> /* EXT_STMT($6) */ (fn($x) => array_map(strtoupper(...), $x))

    |> /* EXT_STMT($9) */ (fn($x) => join( ', ', $x));

/* EXT_STMT */ echo $result, /* EXT_STMT */ "\n";
```

Zend/zend_compile.c

@@ -6534,9 +6534,9 @@ static void zend_compile_pipe(znode *result, zend_ast *ast)
 			callable_ast, arg_list_ast);
 	}
 
+	zend_do_extended_stmt(&operand_result);
+
 	zend_compile_expr(result, fcall_ast);
-	CG(zend_lineno) = fcall_ast->lineno;
-	zend_do_extended_stmt(result);
 }
 
 static void zend_compile_match(znode *result, zend_ast *ast)