[strong] Implement strong mode semantics for the count operation.

src/runtime/runtime-internal.cc

 // Copyright 2014 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/v8.h"
 
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/debug.h"
 #include "src/messages.h"
@@ skipping 85 matching lines @@
 RUNTIME_FUNCTION(Runtime_ThrowIteratorResultNotAnObject) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(Object, value, 0);
   THROW_NEW_ERROR_RETURN_FAILURE(
       isolate,
       NewTypeError(MessageTemplate::kIteratorResultNotAnObject, value));
 }
 
 
+RUNTIME_FUNCTION(Runtime_ThrowStrongModeImplicitConversion) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 0);
+  THROW_NEW_ERROR_RETURN_FAILURE(
+      isolate, NewTypeError(MessageTemplate::kStrongImplicitConversion));
+}
+
+
 RUNTIME_FUNCTION(Runtime_PromiseRejectEvent) {
   DCHECK(args.length() == 3);
   HandleScope scope(isolate);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, promise, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
   CONVERT_BOOLEAN_ARG_CHECKED(debug_event, 2);
   if (debug_event) isolate->debug()->OnPromiseReject(promise, value);
   Handle<Symbol> key = isolate->factory()->promise_has_handler_symbol();
   // Do not report if we actually have a handler.
   if (JSReceiver::GetDataProperty(promise, key)->IsUndefined()) {
@@ skipping 338 matching lines @@
 RUNTIME_FUNCTION(Runtime_GetCallerJSFunction) {
   SealHandleScope shs(isolate);
   StackFrameIterator it(isolate);
   RUNTIME_ASSERT(it.frame()->type() == StackFrame::STUB);
   it.Advance();
   RUNTIME_ASSERT(it.frame()->type() == StackFrame::JAVA_SCRIPT);
   return JavaScriptFrame::cast(it.frame())->function();
 }
 }  // namespace internal
 }  // namespace v8