[kernel] Support for top-level generic functions.

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

Index: pkg/kernel/testcases/closures/capture_closure_parameter.dart.expect
diff --git a/pkg/kernel/testcases/closures/capture_closure_parameter.dart.expect b/pkg/kernel/testcases/closures/capture_closure_parameter.dart.expect
index d977771ff9d37be46260d95fab4cc6a263d0ecd1..78a92b5d174262fa94790eedd3f408a7bf24ff5b 100644
--- a/pkg/kernel/testcases/closures/capture_closure_parameter.dart.expect
+++ b/pkg/kernel/testcases/closures/capture_closure_parameter.dart.expect
@@ -7,12 +7,12 @@ static method main(core::List<core::String> arguments) → dynamic {
   foo.call(arguments.[](0)).call();
 }
 static method closure#main#foo#bar(Vector #contextParameter) → dynamic {
-  core::print(#contextParameter[1]);
+  core::print(#contextParameter[2]);
 }
 static method closure#main#foo(Vector #contextParameter, dynamic x) → dynamic {
-  final Vector #context = MakeVector(2);
-  #context[0] = #contextParameter;
-  #context[1] = x;
+  final Vector #context = MakeVector(3);
+  #context[1] = #contextParameter;
+  #context[2] = x;
   final () → dynamic bar = MakeClosure<() → dynamic>(self::closure#main#foo#bar, #context);
   return bar;
 }