use bitshifting for magic perf boost

src/parse/utils/hash.ts

@@ -3,6 +3,6 @@ export default function hash(str: string): number {
 	let hash = 5381;
 	let i = str.length;
 
-	while (i--) hash = (hash * 33) ^ str.charCodeAt(i);
+	while (i--) hash = ((hash << 5) + hash) ^ str.charCodeAt(i);
 	return hash >>> 0;
 }

src/shared/transitions.js

@@ -27,7 +27,7 @@ export function hash(str) {
 	var hash = 5381;
 	var i = str.length;
 
-	while (i--) hash = (hash * 33) ^ str.charCodeAt(i);
+	while (i--) hash = ((hash << 5) + hash) ^ str.charCodeAt(i);
 	return hash >>> 0;
 }