Rollup merge of #39692 - oli-obk:patch-2, r=aturon
Rollup merge of #39692 - oli-obk:patch-2, r=aturon

remove wrong packed struct test

This UB was found by running the test under [Miri](https://github.com/solson/miri) which rejects these unsafe unaligned loads. :smile:

aidancully/rust,GBGamer/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust