Handle unicode correctly in CallPrinter

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/runtime/runtime-utils.h"
 
 #include <memory>
 
 #include "src/arguments.h"
 #include "src/ast/prettyprinter.h"
@@ skipping 393 matching lines @@
 Handle<String> RenderCallSite(Isolate* isolate, Handle<Object> object) {
   MessageLocation location;
   if (ComputeLocation(isolate, &location)) {
     Zone zone(isolate->allocator());
     std::unique_ptr<ParseInfo> info(
         location.function()->shared()->is_function()
             ? new ParseInfo(&zone, location.function())
             : new ParseInfo(&zone, location.script()));
     if (Parser::ParseStatic(info.get())) {
       CallPrinter printer(isolate, location.function()->shared()->IsBuiltin());
-      const char* string = printer.Print(info->literal(), location.start_pos());
-      if (strlen(string) > 0) {
-        return isolate->factory()->NewStringFromAsciiChecked(string);
-      }
+      Handle<String> str = printer.Print(info->literal(), location.start_pos());
+      if (str->length() > 0) return str;
     } else {
       isolate->clear_pending_exception();
     }
   }
   return Object::TypeOf(isolate, object);
 }
 
 }  // namespace
 
 
@@ skipping 137 matching lines @@
 
 RUNTIME_FUNCTION(Runtime_Typeof) {
   HandleScope scope(isolate);
   DCHECK_EQ(1, args.length());
   CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
   return *Object::TypeOf(isolate, object);
 }
 
 }  // namespace internal
 }  // namespace v8