[JS IR BE] Fix name clash between top-level fields

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/SimpleNameGenerator.kt

@@ -132,6 +132,8 @@ class SimpleNameGenerator : NameGenerator {
                     if (declaration.parent is IrDeclaration) {
                         nameBuilder.append('.')
                         nameBuilder.append(getNameForDeclaration(declaration.parent as IrDeclaration, context))
+                    } else {
+                        nameDeclarator = context.staticContext.rootScope::declareFreshName
                     }
                 }
                 is IrClass -> {

compiler/testData/codegen/box/delegatedProperty/extensionDelegatesWithSameNames.kt

@@ -1,5 +1,4 @@
 // IGNORE_BACKEND: JVM_IR
-// IGNORE_BACKEND: JS_IR
 open class C
 
 object O : C()

compiler/testData/codegen/box/fieldRename/delegates.kt

@@ -1,5 +1,4 @@
 // IGNORE_BACKEND: JVM_IR
-// IGNORE_BACKEND: JS_IR
 import kotlin.reflect.KProperty
 
 public open class TestDelegate<T: Any>(private val initializer: () -> T) {

js/js.translator/testData/box/multiFile/packageAndPrivateDeclarationDoNotClash.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1285
 // FILE: foo.kt
 package foo

js/js.translator/testData/box/multiPackage/packageVariableVisibleFromOtherPackage.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1282
 // FILE: a.kt
 package foo

js/js.translator/testData/box/nameClashes/methodAndPrivateProperty.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1284
 package foo