[Issue 17726] Older DMD versions segfault when building Druntime with GCC 7.1

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17726

--- Comment #7 from Vladimir Panteleev <dlang-bugzilla at thecybershadow.net> ---
GCC 7 uses movdqa/movaps instructions, which require the address to be aligned
to 16 bytes, so GCC expects the elem* instances to be aligned. However, they
aren't aligned in DMD.

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