Refactor enqueuers

pkg/compiler/lib/src/universe/use.dart

Index: pkg/compiler/lib/src/universe/use.dart
diff --git a/pkg/compiler/lib/src/universe/use.dart b/pkg/compiler/lib/src/universe/use.dart
index 7cb642eae11b7f86834091035dda2d5355597c16..5876a1814f49a0f2f4207ed9bd7fe6a56e3a4a2a 100644
--- a/pkg/compiler/lib/src/universe/use.dart
+++ b/pkg/compiler/lib/src/universe/use.dart
@@ -323,6 +323,8 @@ enum TypeUseKind {
   CATCH_TYPE,
   TYPE_LITERAL,
   INSTANTIATION,
+  MIRROR_INSTANTIATION,
+  NATIVE_INSTANTIATION,
 }
 
 /// Use of a [DartType].
@@ -366,6 +368,16 @@ class TypeUse {
     return new TypeUse.internal(type, TypeUseKind.INSTANTIATION);
   }
 
+  /// [type] used in an instantiation through mirrors.
+  factory TypeUse.mirrorInstantiation(InterfaceType type) {
+    return new TypeUse.internal(type, TypeUseKind.MIRROR_INSTANTIATION);
+  }
+
+  /// [type] used in a native instantiation.
+  factory TypeUse.nativeInstantiation(InterfaceType type) {
+    return new TypeUse.internal(type, TypeUseKind.NATIVE_INSTANTIATION);
+  }
+
   bool operator ==(other) {
     if (identical(this, other)) return true;
     if (other is! TypeUse) return false;