Fix VarDecls for tuples. Closes #99. I've implemented it this way since it doesn't require any changes in the frontend. However, I think having TypeTuple expressed as LLVM struct types would make much more sense and open the door to tuple lvalues.

#ifndef LLVMDC_IR_IRMODULE_H
#define LLVMDC_IR_IRMODULE_H

#include "ir/ir.h"

struct Module;

struct IrModule : IrBase
{
    IrModule(Module* module);
    virtual ~IrModule();

    Module* M;

    LLGlobalVariable* dwarfCompileUnit;
};

#endif