aot_autograd: add assert for functional-only graph

[bdhirsh]

Stack from ghstack:

• [test] make optional<c10::SymInt> const ref #85844
• update func test #85875
• -> aot_autograd: add assert for functional-only graph #85681
• fix functionalize() input metadata mutations, migrate core test to use functionalize() #82601
• FX pass to move input mutations into submodule #82602
• fix bernoulli_ for functionalization by making it a primitive wrt torch_dispatch #82771
• remove BC-guarantee for reinplace pass #83265

[pytorch-bot]

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❌ 7 Failures, 1 Pending

As of commit 4189d5a:

The following jobs have failed:

• lintrunner
• linux-bionic-cuda11.6-py3.10-gcc7 / test (default, 1, 4, linux.4xlarge.nvidia.gpu)
• linux-bionic-cuda11.6-py3.10-gcc7 / test (functorch, 1, 1, linux.4xlarge.nvidia.gpu)
• linux-bionic-py3.7-clang9 / test (functorch, 1, 1, linux.2xlarge)
• linux-focal-py3.7-clang7-asan / test (default, 4, 5, linux.2xlarge)
• linux-focal-py3.7-gcc7 / test (functorch, 1, 1, linux.2xlarge)
• win-vs2019-cpu-py3 / test (functorch, 1, 1, windows.4xlarge)

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