[Bug target/120895] AVX data types default alignment is not correct

[david.partridge at perdrix dot co.uk via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120895

--- Comment #5 from David C. Partridge <david.partridge at perdrix dot co.uk> 
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Confirmed that macOS/x64 is also OK, so the problem is just Linux/x64 AFAICT