closure conversion: Support closures in initializers

pkg/kernel/testcases/closures/type_variables.dart.expect

Index: pkg/kernel/testcases/closures/type_variables.dart.expect
diff --git a/pkg/kernel/testcases/closures/type_variables.dart.expect b/pkg/kernel/testcases/closures/type_variables.dart.expect
index 0939dadaad9f2b973e286a1161facb2ad366ec62..b58d4db252fe95f979b21becd0efd3a93e5de9b8 100644
--- a/pkg/kernel/testcases/closures/type_variables.dart.expect
+++ b/pkg/kernel/testcases/closures/type_variables.dart.expect
@@ -13,6 +13,9 @@ class C<T extends core::Object, S extends core::Object> extends core::Object {
     #context.[]=(0, this);
     return new self::Closure#C#foo#function::•<self::C::T, self::C::S>(#context);
   }
+  method bar() → dynamic {
+    self::C<self::C::T, self::C::S> self = this;
+  }
   method baz() → dynamic {
     return new self::Closure#C#baz#function::•<self::C::T, self::C::S>(null);
   }