made some functions 'static' in codegen.cpp.
made some functions 'static' in codegen.cpp.

iamrekcah/clay,mario-campos/clay,iamrekcah/clay,iamrekcah/clay,jckarter/clay,aep/clay,aep/clay,iamrekcah/clay,mario-campos/clay,jckarter/clay,jckarter/clay,mario-campos/clay,aep/clay,aep/clay,iamrekcah/clay,jckarter/clay,aep/clay,mario-campos/clay,mario-campos/clay,jckarter/clay,jckarter/clay,aep/clay