Noalias has been re-enabled.
I bet it’ll last a week.
I’m surprised that didn’t make it into the blog post or detailed changelog. It hadn’t made it to a stable release before has it? Issues were detected and it was disabled prior to that if I recall correctly.
Edit: I can see that the code remains enabled on the 1.54.0 release so I believe you’re right: https://github.com/rust-lang/rust/blob/a178d0322ce20e33eac124758e837cbd80a6f633/compiler/rustc_codegen_llvm/src/abi.rs#L54