Fix a crash in the compiler: we were setting the target of a HInvokeDynamicMethod even if that targ…

sdk/lib/_internal/compiler/implementation/ssa/optimize.dart

Index: sdk/lib/_internal/compiler/implementation/ssa/optimize.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/ssa/optimize.dart	(revision 19354)
+++ sdk/lib/_internal/compiler/implementation/ssa/optimize.dart	(working copy)
@@ -324,7 +324,10 @@
         && selector.isCall()) {
       DartType type = interceptor.instructionType.computeType(compiler);
       ClassElement cls = type.element;
-      node.element = cls.lookupSelector(selector);
+      Element target = cls.lookupSelector(selector);
+      if (selector.applies(target, compiler)) {
+        node.element = target;
+      }
     }
     return node;
   }