[runtime] Allow generic allocation of sloppy arguments.

src/heap/heap.cc

 // Copyright 2012 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/heap/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/ast/scopeinfo.h"
 #include "src/base/bits.h"
@@ skipping 2797 matching lines @@
   }
 
   {
     Handle<FixedArray> empty_literals_array =
         factory->NewFixedArray(1, TENURED);
     empty_literals_array->set(0, *factory->empty_fixed_array());
     set_empty_literals_array(*empty_literals_array);
   }
 
   {
+    Handle<FixedArray> empty_sloppy_arguments_elements =
+        factory->NewFixedArray(2, TENURED);
+    empty_sloppy_arguments_elements->set_map(sloppy_arguments_elements_map());
+    set_empty_sloppy_arguments_elements(*empty_sloppy_arguments_elements);
+  }
+
+  {
     Handle<WeakCell> cell = factory->NewWeakCell(factory->undefined_value());
     set_empty_weak_cell(*cell);
     cell->clear();
 
     Handle<FixedArray> cleared_optimized_code_map =
         factory->NewFixedArray(SharedFunctionInfo::kEntriesStart, TENURED);
     cleared_optimized_code_map->set(SharedFunctionInfo::kSharedCodeIndex,
                                     *cell);
     STATIC_ASSERT(SharedFunctionInfo::kEntriesStart == 1 &&
                   SharedFunctionInfo::kSharedCodeIndex == 0);
@@ skipping 720 matching lines @@
 
   // Allocate the JSObject.
   AllocationSpace space = SelectSpace(pretenure);
   JSObject* js_obj = nullptr;
   AllocationResult allocation = Allocate(map, space, allocation_site);
   if (!allocation.To(&js_obj)) return allocation;
 
   // Initialize the JSObject.
   InitializeJSObjectFromMap(js_obj, properties, map);
   DCHECK(js_obj->HasFastElements() || js_obj->HasFixedTypedArrayElements() ||
-         js_obj->HasFastStringWrapperElements());
+         js_obj->HasFastStringWrapperElements() ||
+         js_obj->HasFastArgumentsElements());
   return js_obj;
 }
 
 
 AllocationResult Heap::AllocateJSObject(JSFunction* constructor,
                                         PretenureFlag pretenure,
                                         AllocationSite* allocation_site) {
   DCHECK(constructor->has_initial_map());
 
   // Allocate the object based on the constructors initial map.
@@ skipping 2814 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8