[JS IR] save JsIrProgramFragment definitions

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

@@ -81,6 +81,8 @@ class JsIrAstDeserializer : JsAstDeserializerBase() {
 
         fragment.dts = proto.dts
 
+        fragment.definitions += proto.definitionsList.map { deserializeString(it) }
+
         return fragment
     }
 

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

@@ -86,6 +86,10 @@ class JsIrAstSerializer: JsAstSerializerBase() {
             fragmentBuilder.setSuiteFunction(serialize(it))
         }
 
+        fragment.definitions.forEach {
+            fragmentBuilder.addDefinitions(serialize(it))
+        }
+
         return fragmentBuilder.build()
     }