45d61b0d26
Migrate `llvm::set_comdat` and `llvm::SetUniqueComdat` to LLVM-C FFI. Note, now we can call `llvm::set_comdat` only when the target actually supports adding comdat. As this has no convenient LLVM-C API, we implement this as `TargetOptions::supports_comdat`. Co-authored-by: Stuart Cook <Zalathar@users.noreply.github.com>
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.