Add MemberEntity.isAbstract and use MemberEntity in function_set.dart

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

Index: pkg/compiler/lib/src/inferrer/type_graph_nodes.dart
diff --git a/pkg/compiler/lib/src/inferrer/type_graph_nodes.dart b/pkg/compiler/lib/src/inferrer/type_graph_nodes.dart
index 3a62a544c2191e073cbdd61aa28282b2056ee591..5ecd80392f1b7042669e33bc8cab1a68e8a382e1 100644
--- a/pkg/compiler/lib/src/inferrer/type_graph_nodes.dart
+++ b/pkg/compiler/lib/src/inferrer/type_graph_nodes.dart
@@ -807,7 +807,7 @@ class DynamicCallSiteTypeInformation extends CallSiteTypeInformation {
   final TypeInformation receiver;
 
   /// Cached targets of this call.
-  Iterable<Element> targets;
+  Iterable<MemberEntity> targets;
 
   DynamicCallSiteTypeInformation(
       MemberTypeInformation context,
@@ -828,7 +828,7 @@ class DynamicCallSiteTypeInformation extends CallSiteTypeInformation {
     if (arguments != null) {
       arguments.forEach((info) => info.addUser(this));
     }
-    for (Element element in targets) {
+    for (MemberElement element in targets) {
       MemberTypeInformation callee = inferrer.types.getInferredTypeOf(element);
       callee.addCall(caller, call);
       callee.addUser(this);
@@ -838,7 +838,8 @@ class DynamicCallSiteTypeInformation extends CallSiteTypeInformation {
     }
   }
 
-  Iterable<Element> get callees => targets.map((e) => e.implementation);
+  Iterable<Element> get callees =>
+      targets.map((MemberElement e) => e.implementation);
 
   TypeMask computeTypedSelector(InferrerEngine inferrer) {
     TypeMask receiverType = receiver.type;
@@ -853,7 +854,7 @@ class DynamicCallSiteTypeInformation extends CallSiteTypeInformation {
   }
 
   bool targetsIncludeComplexNoSuchMethod(InferrerEngine inferrer) {
-    return targets.any((Element e) {
+    return targets.any((MemberElement e) {
       return e is MethodElement &&
           e.isInstanceMember &&
           e.name == Identifiers.noSuchMethod_ &&
@@ -970,7 +971,7 @@ class DynamicCallSiteTypeInformation extends CallSiteTypeInformation {
   }
 
   TypeMask computeType(InferrerEngine inferrer) {
-    Iterable<Element> oldTargets = targets;
+    Iterable<MemberEntity> oldTargets = targets;
     TypeMask typeMask = computeTypedSelector(inferrer);
     inferrer.updateSelectorInTree(caller, call, selector, typeMask);
 
@@ -986,7 +987,7 @@ class DynamicCallSiteTypeInformation extends CallSiteTypeInformation {
     // and a call to `delegate`), we iterate over all these methods to
     // update their parameter types.
     targets = inferrer.closedWorld.allFunctions.filter(selector, maskToUse);
-    Iterable<Element> typedTargets = canReachAll
+    Iterable<MemberEntity> typedTargets = canReachAll
         ? inferrer.closedWorld.allFunctions.filter(selector, typeMask)
         : targets;
 
@@ -995,7 +996,7 @@ class DynamicCallSiteTypeInformation extends CallSiteTypeInformation {
       // Add calls to new targets to the graph.
       targets
           .where((target) => !oldTargets.contains(target))
-          .forEach((element) {
+          .forEach((MemberElement element) {
         MemberTypeInformation callee =
             inferrer.types.getInferredTypeOf(element);
         callee.addCall(caller, call);
@@ -1008,7 +1009,7 @@ class DynamicCallSiteTypeInformation extends CallSiteTypeInformation {
       // Walk over the old targets, and remove calls that cannot happen anymore.
       oldTargets
           .where((target) => !targets.contains(target))
-          .forEach((element) {
+          .forEach((MemberElement element) {
         MemberTypeInformation callee =
             inferrer.types.getInferredTypeOf(element);
         callee.removeCall(caller, call);
@@ -1021,7 +1022,8 @@ class DynamicCallSiteTypeInformation extends CallSiteTypeInformation {
 
     // Walk over the found targets, and compute the joined union type mask
     // for all these targets.
-    TypeMask result = inferrer.types.joinTypeMasks(targets.map((element) {
+    TypeMask result =
+        inferrer.types.joinTypeMasks(targets.map((MemberElement element) {
       // If [canReachAll] is true, then we are iterating over all
       // targets that satisfy the untyped selector. We skip the return
       // type of the targets that can only be reached through
@@ -1081,9 +1083,9 @@ class DynamicCallSiteTypeInformation extends CallSiteTypeInformation {
   void giveUp(InferrerEngine inferrer, {bool clearAssignments: true}) {
     if (!abandonInferencing) {
       inferrer.updateSelectorInTree(caller, call, selector, mask);
-      Iterable<Element> oldTargets = targets;
+      Iterable<MemberEntity> oldTargets = targets;
       targets = inferrer.closedWorld.allFunctions.filter(selector, mask);
-      for (Element element in targets) {
+      for (MemberElement element in targets) {
         if (!oldTargets.contains(element)) {
           MemberTypeInformation callee =
               inferrer.types.getInferredTypeOf(element);
@@ -1098,7 +1100,7 @@ class DynamicCallSiteTypeInformation extends CallSiteTypeInformation {
   }
 
   void removeAndClearReferences(InferrerEngine inferrer) {
-    for (Element element in targets) {
+    for (MemberElement element in targets) {
       ElementTypeInformation callee = inferrer.types.getInferredTypeOf(element);
       callee.removeUser(this);
     }
@@ -1116,8 +1118,8 @@ class DynamicCallSiteTypeInformation extends CallSiteTypeInformation {
 
   bool hasStableType(InferrerEngine inferrer) {
     return receiver.isStable &&
-        targets.every(
-            (element) => inferrer.types.getInferredTypeOf(element).isStable) &&
+        targets.every((MemberElement element) =>
+            inferrer.types.getInferredTypeOf(element).isStable) &&
         (arguments == null || arguments.every((info) => info.isStable)) &&
         super.hasStableType(inferrer);
   }