llvm-project

3eee9fc2 - [libc++][hardening] Introduce assertion semantics. (#149459)

[libc++][hardening] Introduce assertion semantics. (#149459) Assertion semantics closely mimic C++26 Contracts evaluation semantics. This brings our implementation closer in line with C++26 Library Hardening (one particular benefit is that using the `observe` semantic makes adopting hardening easier for projects).