[PATCH] Fix PR15267

[Michael Liao]

Hi All,

The root cause of PR15267 is the current logic assume byte-addressable
element during extloading from a vector. With <4 x i1> in memory, this
logic breaks. The attached patch fixes that by loading all bytes
associated to that type, extracting bits and re-packing them again to
form each element.

Thanks for review!
- Michael

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