[JS IR BE] Reflection support

compiler/testData/codegen/box/enum/kt20651_inlineLambda.kt

@@ -1,5 +1,4 @@
 // IGNORE_BACKEND: JVM_IR
-// IGNORE_BACKEND: JS_IR
 enum class Test(val x: String, val closure1: () -> String) {
     FOO("O", run { { FOO.x } }) {
         override val y: String = "K"

compiler/testData/codegen/box/enum/kt7257.kt

@@ -1,5 +1,4 @@
 // IGNORE_BACKEND: JVM_IR
-// IGNORE_BACKEND: JS_IR
 enum class X {
     B {
         val value2 = "K"