Update codegen to (hopefully) work correctly with newer LLVM trunk, where there's no longer a Fast flag. (It has been replaced by an optimization level) Untested because I haven't compiled that recent an LLVM yet :).

#ifndef LDC_GEN_TOOBJ_H
#define LDC_GEN_TOOBJ_H

void writeModule(llvm::Module* m, std::string filename);

#endif