Unaligned block moves and MEM_ALIGN re-broken

[David Edelsohn]

Richard,

	With your changes to the way memattrs alignment is initialized,
GCC imposes a stricter, mode-based alignment on the MEM than the TYPE
itself defines for that MEM.  This is a regression in GCC which you have
introduced.  I have alerted you to the problem.  If you do not fix the
problem introduced by your patch so that the alignment of the MEM matches
what the type specifies, I will request that your patch which caused this
problem be reverted and/or fixed by someone else.

David