Support mixins when loading from .dill

pkg/compiler/lib/src/ssa/kernel_impact.dart

Index: pkg/compiler/lib/src/ssa/kernel_impact.dart
diff --git a/pkg/compiler/lib/src/ssa/kernel_impact.dart b/pkg/compiler/lib/src/ssa/kernel_impact.dart
index 3704f440c10e9441ef351a281700b6341b2d03a1..6dc679942b3c15f2b0e36e5b636eebae9b916507 100644
--- a/pkg/compiler/lib/src/ssa/kernel_impact.dart
+++ b/pkg/compiler/lib/src/ssa/kernel_impact.dart
@@ -302,7 +302,8 @@ class KernelImpactBuilder extends ir.Visitor {
 
   @override
   void visitSuperInitializer(ir.SuperInitializer node) {
-    ConstructorEntity target = elementAdapter.getConstructor(node.target);
+    ConstructorEntity target =
+        elementAdapter.getSuperConstructor(node.parent, node.target);

[Siggi Cherem (dart-lang), 2017/05/17 16:50:32]

is node.target here the one that was read from the dill file before adding the
synthetic super constructor? Should we instead rewrite node.target to point to
the right target, then getSuperConstructor becomes getConstructor(target)?

[Johnni Winther, 2017/05/18 08:57:03]

Adding a TODO. I have so far been reluctant to put rewrite logic into
kernel_impact, but we might consider it the required pre-step for inference and
ssa-building. 

     _visitArguments(node.arguments);
     impactBuilder.registerStaticUse(new StaticUse.superConstructorInvoke(
         target, elementAdapter.getCallStructure(node.arguments)));