[Issue 16914] Add -mavx switch to generate AVX instructions instead of SSE instructions

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16914

--- Comment #1 from Walter Bright <bugzilla at digitalmars.com> ---
A start:

https://github.com/dlang/dmd/pull/6293

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