Add line table benchmark

Author: thecrypticace

packages/tailwindcss/src/source-maps/line-table.bench.ts

@@ -0,0 +1,13 @@
+import { readFileSync } from 'node:fs'
+import { fileURLToPath } from 'node:url'
+
+import { bench } from 'vitest'
+import { createLineTable } from './line-table'
+
+const currentFolder = fileURLToPath(new URL('..', import.meta.url))
+const cssFile = readFileSync(currentFolder + '../preflight.css', 'utf-8')
+const table = createLineTable(cssFile)
+
+bench('line table lookups', () => {
+  for (let i = 0; i < cssFile.length; ++i) table.find(i)
+})