Add an `llvm::OStream` workalike class for use with `Logger::cout()`, with the crucial difference being special handling of `llvm::Type`s so they get printed by name rather than printing their full representation (which can be positively *huge*). This allows re-enabling some logger calls that were disabled due to extreme verbosity.

#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