We're waisting 8 bytes for every gimple_seq_node_d on x86_64 just because we might be allocating a structure with a long double element (16 byte aligned). I grepped and didn't find traces of such a use, so - can we just document that callers need to round up allocation sizes to multiples of the required alignment (and just enforce that for alignment requirements bigger than pointers)?
A gimple_seq_node_d should be allocated from 24 byte page sizes but are allocated from 32 byte page sizes because of the above issue - wasting 25%. Thanks, Richard.
