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Over-aligned opaque blobs are incorrect on x86. #3279

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@emilio

This is the root cause of https://bugzilla.mozilla.org/show_bug.cgi?id=1985509

The TLDR is that u64 is not aligned to 8 bytes in x86, so using it for opaque blobs is wrong. This is a long-standing issue, but fixing this properly should make our opaque handling a lot more robust.

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