[IR] Fix compatibility mode

- pass corresponding flag to mangler
 - properly handle local declarations in field initializers
 - fix KT-48912

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

@@ -32,7 +32,7 @@ import kotlin.math.abs
 private fun <T> mapToKey(declaration: T): String {
     return with(JsManglerIr) {
         if (declaration is IrDeclaration) {
-            declaration.hashedMangle().toString()
+            declaration.hashedMangle(compatibleMode = false).toString()
         } else if (declaration is String) {
             declaration.hashMangle.toString()
         } else {