AIX: fix another may be uninitialized failure

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/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 4390 matching lines @@
 
 
 AllocationResult Heap::AllocateFixedArrayWithFiller(int length,
                                                     PretenureFlag pretenure,
                                                     Object* filler) {
   DCHECK(length >= 0);
   DCHECK(empty_fixed_array()->IsFixedArray());
   if (length == 0) return empty_fixed_array();
 
   DCHECK(!InNewSpace(filler));
-  HeapObject* result;
+  HeapObject* result = nullptr;
   {
     AllocationResult allocation = AllocateRawFixedArray(length, pretenure);
     if (!allocation.To(&result)) return allocation;
   }
 
   result->set_map_no_write_barrier(fixed_array_map());
   FixedArray* array = FixedArray::cast(result);
   array->set_length(length);
   MemsetPointer(array->data_start(), filler, length);
   return array;
@@ skipping 76 matching lines @@
 
 
 AllocationResult Heap::AllocateExtendedConstantPoolArray(
     const ConstantPoolArray::NumberOfEntries& small,
     const ConstantPoolArray::NumberOfEntries& extended) {
   CHECK(small.are_in_range(0, ConstantPoolArray::kMaxSmallEntriesPerType));
   CHECK(extended.are_in_range(0, kMaxInt));
   int size = ConstantPoolArray::SizeForExtended(small, extended);
   AllocationSpace space = SelectSpace(size, TENURED);
 
-  HeapObject* object;
+  HeapObject* object = nullptr;
   {
     AllocationResult allocation =
         AllocateRaw(size, space, OLD_SPACE, kDoubleAligned);
     if (!allocation.To(&object)) return allocation;
   }
   object->set_map_no_write_barrier(constant_pool_array_map());
 
   ConstantPoolArray* constant_pool = ConstantPoolArray::cast(object);
   constant_pool->InitExtended(small, extended);
   constant_pool->ClearPtrEntries(isolate());
@@ skipping 2147 matching lines @@
     *object_type = "CODE_TYPE";                                                \
     *object_sub_type = "CODE_AGE/" #name;                                      \
     return true;
     CODE_AGE_LIST_COMPLETE(COMPARE_AND_RETURN_NAME)
 #undef COMPARE_AND_RETURN_NAME
   }
   return false;
 }
 }  // namespace internal
 }  // namespace v8