Fix DeepCompile AOT kwargs patching for PyTorch >= v2.11 (#8024)
DeepCompiles breaks for PyTorch >= v2.11 because these versions can
construct the AOT Autograd backend without a bw_compiler kwarg, while
DeepSpeed's Inductor patch assumes that key is always present.
This PR fixes DeepCompile's AOT Autograd patch so unrelated AOT backend
registrations can pass through unchanged. `TestDeepCompile` passes with
this fix.
Signed-off-by: Masahiro Tanaka <mtanaka@anyscale.com>