Fixes dart-lang#2507. Fix roll failures (dart-lang#2508)

Author: sgrekhov

Language/Expressions/Constants/as_type_A01_t01.dart

@@ -72,5 +72,5 @@ main() {
   Expect.identical(const C(), c19);
   Expect.identical(const C(), c20);
   Expect.identical((), c21);
-  Expect.identical((i: 1), c22);
+  Expect.equals((i: 1), c22);
 }

Language/Expressions/Constants/as_type_A01_t03.dart

@@ -45,8 +45,8 @@ main() {
 
   Expect.identical(1, c1);
   Expect.identical(2, c2);
-  Expect.identical((3,), c3);
-  Expect.identical((4,), c4);
-  Expect.identical((i: 5), c5);
-  Expect.identical((i: 6), c6);
+  Expect.equals((3,), c3);
+  Expect.equals((4,), c4);
+  Expect.equals((i: 5), c5);
+  Expect.equals((i: 6), c6);
 }