Widen big concrete types to dynamic.

tests/compiler/dart2js/mock_compiler.dart

Index: tests/compiler/dart2js/mock_compiler.dart
diff --git a/tests/compiler/dart2js/mock_compiler.dart b/tests/compiler/dart2js/mock_compiler.dart
index 883f02be4878bf0af688a3b3bd3f6d8288502d79..7c34a5e93a94557fb3e3173e565c510613420cee 100644
--- a/tests/compiler/dart2js/mock_compiler.dart
+++ b/tests/compiler/dart2js/mock_compiler.dart
@@ -100,12 +100,14 @@ class MockCompiler extends Compiler {
                 bool enableTypeAssertions: false,
                 bool enableMinification: false,
                 bool enableConcreteTypeInference: false,
+                int maxConcreteTypeSize: 5,
                 bool analyzeAll: false})
       : warnings = [], errors = [],
         sourceFiles = new Map<String, SourceFile>(),
         super(enableTypeAssertions: enableTypeAssertions,
               enableMinification: enableMinification,
               enableConcreteTypeInference: enableConcreteTypeInference,
+              maxConcreteTypeSize: maxConcreteTypeSize,
               analyzeAll: analyzeAll) {
     coreLibrary = createLibrary("core", coreSource);
     // We need to set the assert method to avoid calls with a 'null'