[kernel] Support for top-level generic functions.

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

Index: pkg/kernel/testcases/closures/capture_this.dart.expect
diff --git a/pkg/kernel/testcases/closures/capture_this.dart.expect b/pkg/kernel/testcases/closures/capture_this.dart.expect
index 35cfbf40960e730533aa72659cc25783e3b93b9f..72c9280941da16edf0a149774e7ac12f8c1ed037 100644
--- a/pkg/kernel/testcases/closures/capture_this.dart.expect
+++ b/pkg/kernel/testcases/closures/capture_this.dart.expect
@@ -8,13 +8,13 @@ class C extends core::Object {
     : super core::Object::•()
     ;
   method m() → dynamic {
-    final Vector #context = MakeVector(2);
-    #context[1] = this;
+    final Vector #context = MakeVector(3);
+    #context[2] = this;
     return MakeClosure<(dynamic) → dynamic>(self::closure#C#m#function, #context);
   }
   method f() → dynamic {
-    final Vector #context = MakeVector(2);
-    #context[1] = this;
+    final Vector #context = MakeVector(3);
+    #context[2] = this;
     return MakeClosure<() → dynamic>(self::closure#C#f#function, #context);
   }
 }
@@ -29,10 +29,10 @@ static method main() → dynamic {
     throw "Unexpected value from c.f()()(): ${result}";
 }
 static method closure#C#m#function(Vector #contextParameter, dynamic v) → dynamic {
-  return (#contextParameter[1]).x = v;
+  return (#contextParameter[2]).x = v;
 }
 static method closure#C#f#function#function(Vector #contextParameter) → dynamic {
-  return (#contextParameter[1]).x;
+  return (#contextParameter[2]).x;
 }
 static method closure#C#f#function(Vector #contextParameter) → dynamic {
   return MakeClosure<() → dynamic>(self::closure#C#f#function#function, #contextParameter);