Fix many bugs with closure conversion in checked mode.

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

Index: pkg/kernel/testcases/closures/instance_tear_off.dart.expect
diff --git a/pkg/kernel/testcases/closures/instance_tear_off.dart.expect b/pkg/kernel/testcases/closures/instance_tear_off.dart.expect
index 0390f406335e359921e3e76b8968dda80acf6e80..a967843177c358d6a8e148d7c5f70f6f08be1ea8 100644
--- a/pkg/kernel/testcases/closures/instance_tear_off.dart.expect
+++ b/pkg/kernel/testcases/closures/instance_tear_off.dart.expect
@@ -80,21 +80,21 @@ static method main(dynamic arguments) → dynamic {
   self::test(new self::D::•<core::int>());
   self::test(new self::E::•<core::int>());
 }
-static method closure#C#g#function(Vector #contextParameter, dynamic x) → dynamic {
+static method closure#C#g#function(dynamic #contextParameter, dynamic x) → dynamic {
   return "g(${x})";
 }
-static method closure#C#f#function(Vector #contextParameter) → dynamic {
+static method closure#C#f#function(dynamic #contextParameter) → dynamic {
   return "f";
 }
-static method closure#D#g#function(Vector #contextParameter, dynamic x) → dynamic {
+static method closure#D#g#function(dynamic #contextParameter, dynamic x) → dynamic {
   return "g(${x})";
 }
-static method closure#D#f#function(Vector #contextParameter) → dynamic {
+static method closure#D#f#function(dynamic #contextParameter) → dynamic {
   return "f";
 }
-static method closure#E#g#function<T extends core::Object>(Vector #contextParameter, self::closure#E#g#function::T x) → dynamic {
+static method closure#E#g#function<T extends core::Object>(dynamic #contextParameter, self::closure#E#g#function::T x) → dynamic {
   return "g(${x})";
 }
-static method closure#E#f#function(Vector #contextParameter) → dynamic {
+static method closure#E#f#function(dynamic #contextParameter) → dynamic {
   return "f";
 }