Teach `-dgc2stack` to promote GC allocations in simple loops to stack allocations too. (A "simple" loop is one where the allocation isn't used in a subsequent iteration) This also means it's no longer necessary to run this pass multiple times. Running it once after inlining should now catch all cases.

#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