Fix the problems exposed by the callingconv1.d test case. The first was that unless otherwise specified, inputs are assumed to be in registers even if they specify a "matching output" that's in memory. While testing that fix, I also ran into a bug causing the generated "matching output" for any input was always the first one instead of the correct one.

#ifndef LDC_IR_IRMODULE_H
#define LDC_IR_IRMODULE_H

#include "ir/ir.h"

struct Module;

struct IrModule : IrBase
{
    IrModule(Module* module, const char* srcfilename);
    virtual ~IrModule();

    Module* M;

    LLGlobalVariable* fileName;
    llvm::DICompileUnit diCompileUnit;
};

#endif