Throw NoSuchMethod or ArgumentError instead of generating a bailout, when we know the next instruct…

tests/compiler/dart2js/mock_compiler.dart

Index: tests/compiler/dart2js/mock_compiler.dart
===================================================================
--- tests/compiler/dart2js/mock_compiler.dart	(revision 21860)
+++ tests/compiler/dart2js/mock_compiler.dart	(working copy)
@@ -77,7 +77,7 @@
     bool operator==(other) => identical(this, other);
     noSuchMethod(im) { throw im; }
   }
-  class JSIndexable {}
+  abstract class JSIndexable {}
   class JSArray extends Interceptor implements List, JSIndexable {
     var length;
     operator[](index) {}