getIncomingConnectionsByOriginModule(module) {
		const connections = this._getModuleGraphModule(module).incomingConnections;
		return connections.getFromUnorderedCache(getConnectionsByOriginModule);
	}
@param {Module} module the module
@returns {readonly Map<Module | undefined | null, readonly ModuleGraphConnection[]>} reasons why a module is included, in a map by source module