Commits on Oct 23, 2024

1. Add nightly C++11 ABI builds …

   Initially, PyTorch/XLA was built with C++11 ABI, which was a more modern
   ABI (e.g. small string optimizations). However, that conflicts with the
   ABI of upstream PyTorch, so #5650
   disabled the C++11 ABI. It turns out that C++11 ABI improves LazyTensor
   tracing performance drastically for some large models. We can't go back
   to C++11 ABI due to conflict with upstream, so this PR adds additional
   nightly build variants that enable C++11 ABI next to the existing wheels
   and dockers.
   
   The docker images will be tagged like "nightly_3.10_tpuvm_cxx11_20241023"
   instead of "nightly_3.10_tpuvm_20241023".
   
   The wheels will be named like
   "torch_xla-2.6.0.dev20241023.cxx11-cp310-cp310-linux_x86_64.whl" instead
   of "torch_xla-2.6.0.dev20241023-cp310-cp310-linux_x86_64.whl".
   
   This PR also adds support for building C++11 ABI variants for stable
   branches, but we don't activate it yet.
   
   This PR also removes Python 3.8 nightly builds.
   
   Fixes #8306.

   

   tengyifei committed Oct 23, 2024
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