[JS IR] Generate a key using hashedMangle for all IR declarations in mapToKey

It is required to avoid "key" clashes and failing with ISE.

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

@@ -29,7 +29,7 @@ import java.util.*
 // TODO remove direct usages of [mapToKey] from [NameTable] & co and move it to scripting & REPL infrastructure. Review usages.
 private fun <T> mapToKey(declaration: T): String {
     return with(JsManglerIr) {
-        if (declaration is IrDeclaration && isPublic(declaration)) {
+        if (declaration is IrDeclaration) {
             declaration.hashedMangle.toString()
         } else if (declaration is Signature) {
             declaration.toString().hashMangle.toString()
@@ -39,9 +39,6 @@ private fun <T> mapToKey(declaration: T): String {
     }
 }
 
-private fun JsManglerIr.isPublic(declaration: IrDeclaration) =
-    declaration.isExported() && declaration !is IrScript && declaration !is IrVariable && declaration !is IrValueParameter
-
 class NameTable<T>(
     val parent: NameTable<*>? = null,
     val reserved: MutableSet<String> = mutableSetOf(),