Remove removeWhere (microsoft#19082)

Author: Andy

src/compiler/core.ts

@@ -356,21 +356,6 @@ namespace ts {
         return array;
     }
 
-    export function removeWhere<T>(array: T[], f: (x: T) => boolean): boolean {
-        let outIndex = 0;
-        for (const item of array) {
-            if (!f(item)) {
-                array[outIndex] = item;
-                outIndex++;
-            }
-        }
-        if (outIndex !== array.length) {
-            array.length = outIndex;
-            return true;
-        }
-        return false;
-    }
-
     export function filterMutate<T>(array: T[], f: (x: T, i: number, array: T[]) => boolean): void {
         let outIndex = 0;
         for (let i = 0; i < array.length; i++) {