[Bug c++/65945] C++ alignment of nullptr_t is 1 and might cause unaligned stores to the frame

[foom at fuhm dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65945

--- Comment #12 from James Y Knight <foom at fuhm dot net> ---
Since this would at least theoretically be a c++11 ABI change -- although it
seems likely not to impact the ABI of most actual software -- it seems like
it'd be a really good idea to fix it ASAP, before too many people start
depending on GCC 5.1's C++11 ABI.