Canonicalize raw type

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

Index: sdk/lib/_internal/compiler/implementation/ssa/codegen.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ssa/codegen.dart b/sdk/lib/_internal/compiler/implementation/ssa/codegen.dart
index d51850f9278c5bdf8c0d734084f33b01ffe699b8..e6e66f04c7b9406e1cb169e142ff87e30cda7542 100644
--- a/sdk/lib/_internal/compiler/implementation/ssa/codegen.dart
+++ b/sdk/lib/_internal/compiler/implementation/ssa/codegen.dart
@@ -2423,15 +2423,19 @@ abstract class SsaCodeGenerator implements HVisitor, HBlockInformationVisitor {
         use(node.typeInfoCall);
         int index = RuntimeTypeInformation.getTypeVariableIndex(typeVariable);
         js.PropertyAccess field = new js.PropertyAccess.indexed(pop(), index);
-        RuntimeTypeInformation rti = backend.rti;
-        String typeName = rti.getStringRepresentation(arguments.head);
-        js.Expression genericName = new js.LiteralString("'$typeName'");
-        js.Binary eqTest = new js.Binary('===', field, genericName);
         // Also test for 'undefined' in case the object does not have
         // any type variable.
         js.Prefix undefinedTest = new js.Prefix('!', field);
-        result = new js.Binary(
-            '&&', result, new js.Binary('||', undefinedTest, eqTest));
+        if (arguments.head == compiler.types.dynamicType) {
+          result = new js.Binary('&&', result, undefinedTest);
+        } else {
+          RuntimeTypeInformation rti = backend.rti;
+          String typeName = rti.getStringRepresentation(arguments.head);
+          js.Expression genericName = new js.LiteralString("'$typeName'");
+          js.Binary eqTest = new js.Binary('===', field, genericName);
+          result = new js.Binary(
+              '&&', result, new js.Binary('||', undefinedTest, eqTest));
+        }
         arguments = arguments.tail;
       }
       push(result, node);