Moving the WhitenessWitness back to DescriptorArray.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index a7d6faa5e6ca06a8c0e53662dd58bfa1a22a27f1..a5339438add817cf02241fd379846d45d99f6cbb 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -5008,7 +5008,7 @@ MaybeObject* Map::ShareDescriptor(Descriptor* descriptor) {
   DescriptorArray* new_descriptors;
   MaybeObject* maybe_descriptors = DescriptorArray::Allocate(old_size + 1);
   if (!maybe_descriptors->To(&new_descriptors)) return maybe_descriptors;
-  FixedArray::WhitenessWitness witness(new_descriptors);
+  DescriptorArray::WhitenessWitness witness(new_descriptors);
 
   for (int i = 0; i < old_size; ++i) {
     new_descriptors->CopyFrom(i, descriptors, i, witness);
@@ -5198,7 +5198,7 @@ MaybeObject* Map::CopyAddDescriptor(Descriptor* descriptor,
   MaybeObject* maybe_descriptors = DescriptorArray::Allocate(old_size + 1);
   if (!maybe_descriptors->To(&new_descriptors)) return maybe_descriptors;
 
-  FixedArray::WhitenessWitness witness(new_descriptors);
+  DescriptorArray::WhitenessWitness witness(new_descriptors);
 
   // Copy the descriptors, inserting a descriptor.
   for (int i = 0; i < old_size; ++i) {
@@ -12897,7 +12897,7 @@ MaybeObject* StringDictionary::TransformPropertiesToFastFor(
     return maybe_descriptors;
   }
 
-  FixedArray::WhitenessWitness witness(descriptors);
+  DescriptorArray::WhitenessWitness witness(descriptors);
 
   int number_of_allocated_fields =
       number_of_fields + unused_property_fields - inobject_props;