CopyAddDescriptor 1572 src/objects.cc   MaybeObject* maybe_new_map = map()->CopyAddDescriptor(&new_field, flag);
CopyAddDescriptor 1609 src/objects.cc   MaybeObject* maybe_new_map = map()->CopyAddDescriptor(&d, flag);
CopyAddDescriptor 4927 src/objects.h    MUST_USE_RESULT MaybeObject* CopyAddDescriptor(Descriptor* descriptor,