Take noSuchMethod into account when computing the potential targets of a call.

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 21607)
+++ sdk/lib/_internal/compiler/implementation/ssa/optimize.dart	(working copy)
@@ -333,7 +333,11 @@
     Selector selector = receiverType.refine(node.selector, compiler);
     Element element = compiler.world.locateSingleElement(selector);
     // TODO(ngeoffray): Also fold if it's a getter or variable.
-    if (element != null && element.isFunction()) {
+    if (element != null
+        && element.isFunction()
+        // If we found out that the only target is a [:noSuchMethod:],
+        // we just ignore it.
+        && element.name == selector.name) {
       FunctionElement method = element;
 
       if (method.isNative()) {