Add corelib tests

test/codegen/corelib/bool_hashcode_test.dart

Index: test/codegen/corelib/bool_hashcode_test.dart
diff --git a/test/codegen/language/left_shift_test.dart b/test/codegen/corelib/bool_hashcode_test.dart
similarity index 66%
copy from test/codegen/language/left_shift_test.dart
copy to test/codegen/corelib/bool_hashcode_test.dart
index 7f151b10ffd2a557114f72f6bb3097625737f4f2..d33b14a05d59e88b215f2ebd99414c669ffb12c0 100644
--- a/test/codegen/language/left_shift_test.dart
+++ b/test/codegen/corelib/bool_hashcode_test.dart
@@ -4,10 +4,12 @@
 
 import "package:expect/expect.dart";
 
-main() {
-  for (int i = 0; i < 80; i++) {
-    var a = -1 << i;
-    var b = -1;
-    Expect.equals(1 << i, a ~/ b);
+class BoolHashCodeTest {
+  static testMain() {
+    Expect.notEquals(true.hashCode, false.hashCode);
   }
 }
+
+main() {
+  BoolHashCodeTest.testMain();
+}