Cached member scope creation

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/serialization/KonanPackageFragment.kt

@@ -60,14 +60,14 @@ class KonanPackageFragment(
         KonanClassDataFinder(proto, nameResolver)
     }
 
-    override fun getMemberScope(): DeserializedPackageMemberScope {
-        val packageProto = proto.getPackage()
-
-        return DeserializedPackageMemberScope( this, packageProto,
-            nameResolver, /* containerSource = */ null,
-            components, {loadClassNames()} )
+    private val memberScope_ by lazy {
+        DeserializedPackageMemberScope(this, proto.getPackage(),
+                nameResolver, /* containerSource = */ null,
+                components, { loadClassNames() })
     }
 
+    override fun getMemberScope(): DeserializedPackageMemberScope = memberScope_
+
     private val classifierNames by lazy {
         val result = mutableSetOf<Name>()
         result.addAll(loadClassNames())