Alligned gc allocation of struct

[Sjoerd Nijboer via Digitalmars-d-learn]

I've got a `struct Foo{ubyte16 field1, field2.... fieldn;}` for 
which I would like a heap allocation `Foo* foo = new Foo();` But 
the fields itsself must be 16 bytes aligned for SIMD instructions.
Is there a neat way to do this in D?
As far as I can tell the GC_allocator doesn't do aligned 
allocations by default.