Rollup merge of #143859 - orlp:thread-into-raw-align, r=jhpratt

Guarantee 8 bytes of alignment in Thread::into_raw

When using `AtomicPtr` for synchronization it's incredibly useful when you've got a couple bits you can stuff metadata in. By guaranteeing that `Thread`'s `Inner` struct is aligned to 8 bytes everyone can use the bottom 3 bits to signal other things, such as a critical section, etc.

This guarantee is thus very useful and costs us nothing.

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