Realized that the logic for reordering in the Metal backend is general enough to allow reorders even for nodes which dependencies might not be represented in the graph. The reason is that we keep track of the actual sources and destinations (either memory addresses or tensors) which is more general than the graph dependencies.

For example, the order of these ops would be preserved:

ggml_build_forward_expand(gf, ggml_cpy(a, view(b));
ggml_something(b or another_view(b));

Reordering of CPY ops is useful in Whisper graphs.