viable/strict/1788758887: [dynamo] Fix FP64 softmax repro arguments (#194595)

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Issue Fixes #194594 Summary Update cast_dtype_args_to_fp64 to disable half_to_float after softmax and log-softmax inputs are promoted to FP64. Cover the default and out overloads with positional and keyword arguments using a device-independent CPU regression test. Testing python -m py_compile test/dynamo/test_debug_utils.py torch/_dynamo/debug_utils.py lintrunner --take PYFMT,FLAKE8,RUFF,TYPEIGNORE,TYPENOSKIP,NOQA,T…

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