Function rustc_codegen_llvm::back::write::optimize_with_new_llvm_pass_manager

pub(crate) unsafe fn optimize_with_new_llvm_pass_manager(
    cgcx: &CodegenContext<LlvmCodegenBackend>, 
    module: &ModuleCodegen<ModuleLlvm>, 
    config: &ModuleConfig, 
    opt_level: OptLevel, 
    opt_stage: OptStage
)