Revert "Ensure that all of PyTorch/XLA C++ is compiled with exceptions enabled. (#9146)"

This reverts commit 8450607.

Author: yaoshiang

bazel/rules_def.bzl

@@ -26,6 +26,7 @@ def ptxla_cc_test(
         linkstatic = True,
         copts = copts + [
             "-isystemexternal/torch",  # Required for system includes.
+            "-fexceptions",  # Required for testing crashes.
         ],
         deps = deps + [
             "@pybind11//:pybind11_embed",  # libpython