Update XLA to latest upstream revision. Major rework of the Nix
packaging to handle rules_python's hermetic Python toolchain, which
downloads a pre-built CPython binary that requires patchelf in the
Nix sandbox.
Key changes:
- Patch rules_python to patchelf the hermetic Python binary using
NIX_DYNAMIC_LINKER from --repo_env
- Normalize /nix/store paths in the deps archive for reproducibility
- Remove non-deterministic .pyc files from deps
- Fix #!/usr/bin/env shebangs in rules_python for the Nix sandbox
- Drop aarch64-darwin and aarch64-linux platforms (blocked by upstream
oneDNN bug: https://github.com/openxla/xla/issues/38673)
Samuel Ainsworth
ea049e0770