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2707cd670c
cg_llvm: Clean up FFI calls for setting module flags This is a combination of several inter-related changes to how module flags are set: - Remove some unnecessary code for setting an `"LTOPostLink"` flag, which has been obsolete since LLVM 17. - Define our own enum instead of relying on enum values defined by LLVM's unstable C++ API. - Use safe wrapper functions to set module flags, instead of direct `unsafe` calls. - Consistently pass pointer/length strings instead of C strings. - Remove or shrink some `unsafe` blocks.
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.