Initialize elements pointer in BuildCloneShallowArray when allocation folding is turned off for arr…

src/hydrogen.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2602 matching lines @@
               boilerplate, static_cast<HValue*>(NULL), access));
     }
   }
 
   // Create an allocation site info if requested.
   if (mode == TRACK_ALLOCATION_SITE) {
     BuildCreateAllocationMemento(
         object, Add<HConstant>(JSArray::kSize), allocation_site);
   }
 
-  // We have to initialize the elements pointer if allocation folding is
-  // turned off.
-  if (!FLAG_use_gvn || !FLAG_use_allocation_folding) {
-    HConstant* empty_fixed_array = Add<HConstant>(
-        isolate()->factory()->empty_fixed_array());
-    Add<HStoreNamedField>(object, HObjectAccess::ForElementsPointer(),
-        empty_fixed_array, INITIALIZING_STORE);
-  }
+  if (length > 0) {
+    // We have to initialize the elements pointer if allocation folding is
+    // turned off.
+    if (!FLAG_use_gvn || !FLAG_use_allocation_folding) {
+      HConstant* empty_fixed_array = Add<HConstant>(
+          isolate()->factory()->empty_fixed_array());
+      Add<HStoreNamedField>(object, HObjectAccess::ForElementsPointer(),
+          empty_fixed_array, INITIALIZING_STORE);
+    }
 
-  if (length > 0) {
     HValue* boilerplate_elements = AddLoadElements(boilerplate);
     HValue* object_elements;
     if (IsFastDoubleElementsKind(kind)) {
       HValue* elems_size = Add<HConstant>(FixedDoubleArray::SizeFor(length));
       object_elements = Add<HAllocate>(elems_size, HType::Tagged(),
           NOT_TENURED, FIXED_DOUBLE_ARRAY_TYPE);
     } else {
       HValue* elems_size = Add<HConstant>(FixedArray::SizeFor(length));
       object_elements = Add<HAllocate>(elems_size, HType::Tagged(),
           NOT_TENURED, FIXED_ARRAY_TYPE);
@@ skipping 9001 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal