[JS IR BE] Unmute tests

compiler/testData/codegen/box/controlStructures/quicksort.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 fun IntArray.swap(i:Int, j:Int) {
     val temp = this[i]
     this[i] = this[j]

compiler/testData/codegen/box/controlStructures/tryCatchInExpressions/tryAndContinue.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 fun idiv(a: Int, b: Int): Int =
         if (b == 0) throw Exception("Division by zero") else a / b