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.

#include "gen/llvm.h"
#include "ir/irmodule.h"

IrModule::IrModule(Module* module)
{
    M = module;
    dwarfCompileUnit = NULL;
}

IrModule::~IrModule()
{
}