Yuki Okushi dc464f20a1
Rollup merge of #87127 - poliorcetics:ptr-rotate-safety, r=scottmcm
Add safety comments in private core::slice::rotate::ptr_rotate function

Helps with #66219.

```@rustbot``` label C-cleanup T-compiler T-libs
2021-07-15 21:19:19 +09:00
..
2021-06-23 16:26:46 -04:00