Stack realignment configure option?

[Daniel Santos]

I've read up a bit on the issues with realignment on Wine 64 and all of 
the programs that crash because they luckily get away with violating the 
ABI on Windows. While not crashing is a pretty good thing, forcing stack 
realignment also affects optimizations in some less obvious ways, 
inhibiting sibling calls, ret from function bodies, adding a frame 
pointer, etc. I don't actually have any bright ideas for this atm, but 
can we at least add a configure option to disable this for those who 
don't happen to have such programs crashing? Probably only Gentoo users 
and geeks will care for it.