TORCHINDUCTOR_TRACE=1 asserts on self.debug_path

[ngimel]

After pytorch/pytorch#87438 I can't run with TORCHINDUCTOR_TRACE=1:

import torch
import torch._inductor
import torch._dynamo as torchdynamo

@torchdynamo.optimize("inductor")
def div(x, y):
    return torch.ops.aten.div(x, y)


x = torch.randn(4, dtype=torch.float, device="cuda:0", requires_grad=True)
y = torch.randn(4, dtype=torch.float, device="cuda:0")
out = div(x,y)
out.backward(torch.rand_like(x))

asserts

  File "/scratch/ngimel/work/pytorch/torch/_inductor/compile_fx.py", line 362, in bw_compiler
    return compile_fx_inner(
  File "/scratch/ngimel/work/pytorch/torch/_dynamo/debug_utils.py", line 466, in debug_wrapper
    compiled_fn = compiler_fn(gm, example_inputs, **kwargs)
  File "/scratch/ngimel/work/pytorch/torch/_inductor/debug.py", line 176, in inner
    with DebugContext():
  File "/scratch/ngimel/work/pytorch/torch/_inductor/debug.py", line 243, in __enter__
    self._path = self.create_debug_dir()
  File "/scratch/ngimel/work/pytorch/torch/_inductor/debug.py", line 185, in create_debug_dir
    dynamo_utils.get_debug_dir(),
  File "/scratch/ngimel/work/pytorch/torch/_dynamo/utils.py", line 965, in get_debug_dir
    return debug_dir.get()
  File "/scratch/ngimel/work/pytorch/torch/_dynamo/utils.py", line 957, in get
    assert self.debug_path is not None
AssertionError

when run with TORCHINDUCTOR_TRACE=1
cc @mlazos