Don't add empty typeinfo lists

pkg/compiler/lib/src/ssa/builder.dart

Index: pkg/compiler/lib/src/ssa/builder.dart
diff --git a/pkg/compiler/lib/src/ssa/builder.dart b/pkg/compiler/lib/src/ssa/builder.dart
index 65af5faef8cf88617965bb74a2ed2e3315ab6f99..42b2f5af5a060a1d66021d5b6c944be23d337a71 100644
--- a/pkg/compiler/lib/src/ssa/builder.dart
+++ b/pkg/compiler/lib/src/ssa/builder.dart
@@ -2326,7 +2326,8 @@ class SsaBuilder extends ast.Visitor
     }
     removeInlinedInstantiation(type);
     // Create the runtime type information, if needed.
-    if (backend.classNeedsRti(classElement)) {
+    if (classElement.typeVariables.isNotEmpty &&
+        backend.classNeedsRti(classElement)) {
       // Read the values of the type arguments and create a HTypeInfoExpression
       // to set on the newly create object.  We can identify the case where the
       // expression would be of the form: