getOrCreateModuleMask = mod => {
					let id = maskByModule.get(mod);
					if (id === undefined) {
						id = nextModuleMask;
						ordinalModules.push(mod);
						maskByModule.set(mod, id);
						nextModuleMask <<= ONE_BIGINT;
					}
					return id;
				}
Gets or creates a unique mask for a module
@param {Module} mod the module to get the mask for
@returns {bigint} the module mask to uniquely identify the module