We have a working parsing support for the 'allocate' directive
(failing immediately with a sorry after parsing).

To be in line with the rest of the allocat(e,or) etc. handling,
it makes sense to take care of 'align' as well, which is this
patch does - it still fails with a 'sorry' after parsing.

OK for mainline?

Tobias
-----------------
Siemens Electronic Design Automation GmbH; Anschrift: Arnulfstraße 201, 80634 München; Gesellschaft mit beschränkter Haftung; Geschäftsführer: Thomas Heurung, Frank Thürauf; Sitz der Gesellschaft: München; Registergericht München, HRB 106955