Fix uninitialized FixedArray potentially being left behind by ElementsTransitionGenerator::Generate…

src/runtime/runtime-test.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/deoptimizer.h"
 #include "src/full-codegen.h"
 #include "src/runtime/runtime.h"
@@ skipping 229 matching lines @@
   StringCharacterStream stream(string, &op);
   while (stream.HasMore()) {
     uint16_t character = stream.GetNext();
     PrintF("%c", character);
   }
   return string;
 }
 
 
 RUNTIME_FUNCTION(Runtime_SystemBreak) {
-  SealHandleScope shs(isolate);
+  // The code below doesn't create handles, but when breaking here in GDB
+  // having a handle scope might be useful.
+  HandleScope scope(isolate);
   DCHECK(args.length() == 0);
   base::OS::DebugBreak();
   return isolate->heap()->undefined_value();
 }
 
 
 // Sets a v8 flag.
 RUNTIME_FUNCTION(Runtime_SetFlags) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
@@ skipping 177 matching lines @@
   RUNTIME_FUNCTION(Runtime_HasFixed##Type##Elements) {                        \
     CONVERT_ARG_CHECKED(JSObject, obj, 0);                                    \
     return isolate->heap()->ToBoolean(obj->HasFixed##Type##Elements());       \
   }
 
 TYPED_ARRAYS(FIXED_TYPED_ARRAYS_CHECK_RUNTIME_FUNCTION)
 
 #undef FIXED_TYPED_ARRAYS_CHECK_RUNTIME_FUNCTION
 }
 }  // namespace v8::internal