[llvm] [LowerBufferFatPointers] Don't lose data from unaligned < word vectors (PR #132981)

[Krzysztof Drewniak via llvm-commits]

krzysz00 wrote:

> Only if the target enabled unaligned access, I hope

What do you mean by "enabled unaligned access?" Is there a flag for this? 

(From what I can tell, this would require the IR creator to set the alignment to less than the native alignment of the vector and for LLVM to fail to infer a stronger alignment)

https://github.com/llvm/llvm-project/pull/132981