[ic] Support non-code handlers in megamorphic stub cache.

test/cctest/test-code-stub-assembler.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/utils/random-number-generator.h"
 #include "src/code-factory.h"
 #include "src/code-stub-assembler.h"
 #include "src/compiler/node.h"
 #include "src/ic/stub-cache.h"
 #include "src/isolate.h"
@@ skipping 1328 matching lines @@
     stub_cache.Set(*name, receiver->map(), *handler);
   }
 
   // Perform some queries.
   bool queried_existing = false;
   bool queried_non_existing = false;
   for (int i = 0; i < N; i++) {
     int index = rand_gen.NextInt();
     Handle<Name> name = names[index % names.size()];
     Handle<JSObject> receiver = receivers[index % receivers.size()];
-    Code* handler = stub_cache.Get(*name, receiver->map());
+    Object* handler = stub_cache.Get(*name, receiver->map());
     if (handler == nullptr) {
       queried_non_existing = true;
     } else {
       queried_existing = true;
     }
 
-    Handle<Code> expected_handler(handler, isolate);
+    Handle<Object> expected_handler(handler, isolate);
     ft.CheckTrue(receiver, name, expected_handler);
   }
 
   for (int i = 0; i < N; i++) {
     int index1 = rand_gen.NextInt();
     int index2 = rand_gen.NextInt();
     Handle<Name> name = names[index1 % names.size()];
     Handle<JSObject> receiver = receivers[index2 % receivers.size()];
-    Code* handler = stub_cache.Get(*name, receiver->map());
+    Object* handler = stub_cache.Get(*name, receiver->map());
     if (handler == nullptr) {
       queried_non_existing = true;
     } else {
       queried_existing = true;
     }
 
-    Handle<Code> expected_handler(handler, isolate);
+    Handle<Object> expected_handler(handler, isolate);
     ft.CheckTrue(receiver, name, expected_handler);
   }
   // Ensure we performed both kind of queries.
   CHECK(queried_existing && queried_non_existing);
 }
 
 TEST(GotoIfException) {
   typedef CodeStubAssembler::Label Label;
   typedef CodeStubAssembler::Variable Variable;
   Isolate* isolate(CcTest::InitIsolateOnce());
@@ skipping 121 matching lines @@
 
   Handle<Object> constructor =
       Object::GetPropertyOrElement(result,
                                    isolate->factory()->constructor_string())
           .ToHandleChecked();
   CHECK(constructor->SameValue(*isolate->type_error_function()));
 }
 
 }  // namespace internal
 }  // namespace v8