[Bug sanitizer/70712] False positive from AddressSanitizer with use of 'alignas'

[kcc at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70712

--- Comment #1 from Kostya Serebryany <kcc at gcc dot gnu.org> ---
Does not happen with clang: 
clang++ -fsanitize=address alignas.cc -std=c++11 && ./a.out 
So this is gcc-specific.