Add some tests related to type equality after reload.

runtime/vm/isolate_reload_test.cc

Index: runtime/vm/isolate_reload_test.cc
diff --git a/runtime/vm/isolate_reload_test.cc b/runtime/vm/isolate_reload_test.cc
index 6f36ba0aee90c2523d04a7b8e3f8a59e421ece82..fe35bd82e9c937e153c681e146e692b32e1c72b8 100644
--- a/runtime/vm/isolate_reload_test.cc
+++ b/runtime/vm/isolate_reload_test.cc
@@ -544,6 +544,104 @@ TEST_CASE(IsolateReload_Generics) {
 }
 
 
+TEST_CASE(IsolateReload_TypeIdentity) {
+  const char* kScript =
+      "import 'test:isolate_reload_helper';\n"
+      "class T { }\n"
+      "getType() => T;\n"
+      "main() {\n"
+      "  var oldType = getType();\n"
+      "  reloadTest();\n"
+      "  var newType = getType();\n"
+      "  return identical(oldType, newType).toString();\n"
+      "}\n";
+
+  Dart_Handle lib = TestCase::LoadTestScript(kScript, NULL);
+  EXPECT_VALID(lib);
+
+  const char* kReloadScript =
+      "import 'test:isolate_reload_helper';\n"
+      "class T extends Stopwatch { }\n"
+      "getType() => T;\n"
+      "main() {\n"
+      "  var oldType = getType();\n"
+      "  reloadTest();\n"
+      "  var newType = getType();\n"
+      "  return identical(oldType, newType).toString();\n"
+      "}\n";
+
+  TestCase::SetReloadTestScript(kReloadScript);
+
+  EXPECT_STREQ("true", SimpleInvokeStr(lib, "main"));
+}
+
+
+TEST_CASE(IsolateReload_TypeIdentityGeneric) {
+  const char* kScript =
+      "import 'test:isolate_reload_helper';\n"
+      "class T<G> { }\n"
+      "getType() => new T<int>().runtimeType;\n"
+      "main() {\n"
+      "  var oldType = getType();\n"
+      "  reloadTest();\n"
+      "  var newType = getType();\n"
+      "  return identical(oldType, newType).toString();\n"
+      "}\n";
+
+  Dart_Handle lib = TestCase::LoadTestScript(kScript, NULL);
+  EXPECT_VALID(lib);
+
+  const char* kReloadScript =
+      "import 'test:isolate_reload_helper';\n"
+      "class T<G> extends Stopwatch { }\n"
+      "getType() => new T<int>().runtimeType;\n"
+      "main() {\n"
+      "  var oldType = getType();\n"
+      "  reloadTest();\n"
+      "  var newType = getType();\n"
+      "  return identical(oldType, newType).toString();\n"
+      "}\n";
+
+  TestCase::SetReloadTestScript(kReloadScript);
+
+  EXPECT_STREQ("true", SimpleInvokeStr(lib, "main"));
+}
+
+
+TEST_CASE(IsolateReload_TypeIdentityParameter) {
+  const char* kScript =
+      "import 'dart:mirrors';\n"
+      "import 'test:isolate_reload_helper';\n"
+      "class T<G> { }\n"
+      "getTypeVar() => reflectType(T).typeVariables[0];\n"
+      "main() {\n"
+      "  var oldType = getTypeVar();\n"
+      "  reloadTest();\n"
+      "  var newType = getTypeVar();\n"
+      "  return (oldType == newType).toString();\n"
+      "}\n";
+
+  Dart_Handle lib = TestCase::LoadTestScript(kScript, NULL);
+  EXPECT_VALID(lib);
+
+  const char* kReloadScript =
+      "import 'dart:mirrors';\n"
+      "import 'test:isolate_reload_helper';\n"
+      "class T<G> extends Stopwatch { }\n"
+      "getTypeVar() => reflectType(T).typeVariables[0];\n"
+      "main() {\n"
+      "  var oldType = getTypeVar();\n"
+      "  reloadTest();\n"
+      "  var newType = getTypeVar();\n"
+      "  return (oldType == newType).toString();\n"
+      "}\n";
+
+  TestCase::SetReloadTestScript(kReloadScript);
+
+  EXPECT_STREQ("true", SimpleInvokeStr(lib, "main"));
+}
+
+
 TEST_CASE(IsolateReload_MixinChanged) {
   const char* kScript =
       "class Mixin1 {\n"