topperc wrote:

> I'm not strongly opposed to this or anything, but it feels questionable to be 
> doing a backport to change the target-feature syntax. My understand is that 
> these are purely internal names. This isn't a documented public interface.

It isn't documented, but some users were using `-Xclang -target-feature -Xclang 
-unaligned-scalar-mem` with clang 17 to get this functionality. 
-mno-strict-align does not exist in clang 17.

I'm going to experiment with reworking this patch to make `-Xclang 
-target-feature -Xclang -unaligned-scalar-mem` work and also leave 
`fast-unaligned-access` working to cover both scalar and vector.

https://github.com/llvm/llvm-project/pull/92143
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