How to include ommited function chunk due to faulty dump in hex-rays decompiler

With a faulty dump executable file, some conditional variables are defined although they are undefined in the real executable file. In such cases, hex-rays decomipler misunderstand the conditional expressions have constants and omit code chunks such that the decompiled function code contains small part of the original function. If we undefine the constants, then decompiler contains the ommited area.