function isIIFE(node) {
			return (
				(node.type === "FunctionExpression" ||
					node.type === "ArrowFunctionExpression") &&
				node.parent &&
				node.parent.type === "CallExpression" &&
				node.parent.callee === node
			);
		}
Identifies is a node is a FunctionExpression which is part of an IIFE
@param {ASTNode} node Node to test
@returns {boolean} True if it's an IIFE