Split TypedSelector into Selector and TypeMask.

pkg/compiler/lib/src/inferrer/closure_tracer.dart

Index: pkg/compiler/lib/src/inferrer/closure_tracer.dart
diff --git a/pkg/compiler/lib/src/inferrer/closure_tracer.dart b/pkg/compiler/lib/src/inferrer/closure_tracer.dart
index 844c76a854d6571de38d645e3ddf8b6bbd0c950f..262f652c8e9b52700739efc601d09d49984c1ed0 100644
--- a/pkg/compiler/lib/src/inferrer/closure_tracer.dart
+++ b/pkg/compiler/lib/src/inferrer/closure_tracer.dart
@@ -38,10 +38,11 @@ class ClosureTracerVisitor extends TracerVisitor<ApplyableTypeInformation> {
 
   void analyzeCall(CallSiteTypeInformation info) {
     Selector selector = info.selector;
+    TypeMask mask = info.mask;
     tracedElements.forEach((FunctionElement functionElement) {
       if (!selector.signatureApplies(functionElement)) return;
       inferrer.updateParameterAssignments(info, functionElement, info.arguments,
-          selector, remove: false, addToQueue: false);
+          selector, mask, remove: false, addToQueue: false);
     });
   }