[JS IR] Support object declaration export

Fixes KT-39117 and KT-39367

js/js.translator/testData/box/jsName/avoidNameClash.kt

@@ -1,9 +1,5 @@
 // EXPECTED_REACHABLE_NODES: 1290
 
-// TODO: Support JsExport on object declarations: KT-39117
-// IGNORE_BACKEND: JS_IR
-// IGNORE_BACKEND: JS_IR_ES6
-
 @JsExport
 object A {
     @JsName("js_method") fun f() = "method"

js/js.translator/testData/box/jsName/simpleJsName.kt

@@ -1,9 +1,5 @@
 // EXPECTED_REACHABLE_NODES: 1291
 
-// TODO: Support JsExport on object declarations: KT-39117
-// IGNORE_BACKEND: JS_IR
-// IGNORE_BACKEND: JS_IR_ES6
-
 @JsExport
 object A {
     @JsName("js_f") fun f(x: Int) = "f($x)"