Rollup of 7 pull requests Successful merges: - #117744 (Add -Zuse-sync-unwind) - #118649 (Make inductive cycles in coherence ambiguous always) - #118979 (Use `assert_unsafe_precondition` for `char::from_u32_unchecked`) - #119619 (mir-opt and custom target fixes) - #119632 (Fix broken build for ESP IDF due to #119026) - #119712 (Adding alignment to the cases to test for specific error messages.) - #119734 (Miri subtree update) r? `@ghost` `@rustbot` modify labels: rollup