dart2js-kernel: Bind type variables in generative constructor.

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

Index: pkg/compiler/lib/src/ssa/type_builder.dart
diff --git a/pkg/compiler/lib/src/ssa/type_builder.dart b/pkg/compiler/lib/src/ssa/type_builder.dart
index f8b332ceb1a01814f0e8fd4380a9fbacb6dffb71..7b65daa0d851414334e1ee959d9ae0806d900399 100644
--- a/pkg/compiler/lib/src/ssa/type_builder.dart
+++ b/pkg/compiler/lib/src/ssa/type_builder.dart
@@ -165,6 +165,7 @@ class TypeBuilder {
   /// Check that [type] is valid in the context of `localsHandler.contextClass`.
   /// This should only be called in assertions.
   bool assertTypeInContext(ResolutionDartType type, [Spannable spannable]) {
+    if (builder.compiler.options.useKernel) return true;
     return invariant(spannable == null ? CURRENT_ELEMENT_SPANNABLE : spannable,
         () {
       ClassElement contextClass = Types.getClassContext(type);