[boost] type_with_alignment size fix

From: Douglas Gregor (gregod_at_[hidden])
Date: 2003-04-16 08:41:52

type_with_alignment was generating huge types on most platforms, because it 
would take every type with the right alignment into a union. On x86, for 
instance, double and int have the same alignment (4), so 
sizeof(type_with_alignment<4>::type)=12! type_with_alignment now takes the 
first type whose alignment matches, and the types are roughly ordered by 
size, so the resulting type size should be smaller. 

        Doug