Auto merge of #154638 - JonathanBrouwer:rollup-oLBZ6Tr, r=JonathanBrouwer

Rollup of 4 pull requests

Successful merges:

 - rust-lang/rust#150752 (Update libc to v0.2.183)
 - rust-lang/rust#152432 (add rustc option -Zpacked-stack)
 - rust-lang/rust#154634 (Use `Hcx`/`hcx` consistently for `StableHashingContext`.)
 - rust-lang/rust#154635 (./x run miri: default to edition 2021)

Author: bors