[Bug target/56564] movdqa on possibly-8-byte-aligned struct with -O3

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56564

--- Comment #19 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The mingw/cygwin stuff.  The testcases assume that the symbols have
decl_binds_to_current_def_p false, if that isn't the case (because darwin/mingw
apparently don't allow symbol interposition), then the testcase can't work on
those.