* Move to depth-first serialization of graph for better cache behavior

* Added comment

* Force 64 byte stack alignment to avoid crashes from unaligned AVX loads/stores

* Revert "Force 64 byte stack alignment to avoid crashes from unaligned AVX loads/stores"

This reverts commit 84346420fbd0fbd5d05a4a1e8f5fae12bdc7348b.

* revert to breadth-first serialization