Register inlining as a StaticUse

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 d54815c4da07aa6e838fcb4985fd2aca7dcc4b59..9f5482be1b6ecba16d83e0cd4a924789fe4e669a 100644
--- a/pkg/compiler/lib/src/universe/use.dart
+++ b/pkg/compiler/lib/src/universe/use.dart
@@ -81,6 +81,7 @@ enum StaticUseKind {
   REDIRECTION,
   DIRECT_INVOKE,
   DIRECT_USE,
+  INLINING,
 }
 
 /// Statically known use of an [Element].
@@ -338,6 +339,11 @@ class StaticUse {
     return new StaticUse.internal(element, StaticUseKind.DIRECT_USE);
   }
 
+  /// Inlining of [element].
+  factory StaticUse.inlining(FunctionEntity element) {
+    return new StaticUse.internal(element, StaticUseKind.INLINING);
+  }
+
   bool operator ==(other) {
     if (identical(this, other)) return true;
     if (other is! StaticUse) return false;