Method GetOrCreateLLVMGlobal

GetOrCreateLLVMGlobal - If the specified mangled name is not in the module, create and return an llvm GlobalVariable with the specified type. If there is something in the module with the specified name, return it potentially bitcasted to the right type. If D is non-null, it specifies a decl that correspond to this. This is used to set the attributes on the global when it is first created. If I