0fa3190394
Implement `black_box` using intrinsic Introduce `black_box` intrinsic, as suggested in https://github.com/rust-lang/rust/pull/87590#discussion_r680468700. This is still codegenned as empty inline assembly for LLVM. For MIR interpretation and cranelift it's treated as identity. cc `@Amanieu` as this is related to inline assembly cc `@bjorn3` for rustc_codegen_cranelift changes cc `@RalfJung` as this affects MIRI r? `@nagisa` I suppose
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.