Skips test_addcmul_cuda if using ROCm (#44304)
Summary:
This test is failing consistently on linux-bionic-rocm3.7-py3.6-test2. Relevant log snippet:
```
03:43:11 FAIL: test_addcmul_cuda_float16 (__main__.TestForeachCUDA)
03:43:11 ----------------------------------------------------------------------
03:43:11 Traceback (most recent call last):
03:43:11 File "/var/lib/jenkins/.local/lib/python3.6/site-packages/torch/testing/_internal/common_utils.py", line 818, in wrapper
03:43:11 method(*args, **kwargs)
03:43:11 File "/var/lib/jenkins/.local/lib/python3.6/site-packages/torch/testing/_internal/common_device_type.py", line 258, in instantiated_test
03:43:11 result = test(self, *args)
03:43:11 File "test_foreach.py", line 83, in test_addcmul
03:43:11 self._test_pointwise_op(device, dtype, torch._foreach_addcmul, torch._foreach_addcmul_, torch.addcmul)
03:43:11 File "test_foreach.py", line 58, in _test_pointwise_op
03:43:11 self.assertEqual(tensors, expected)
03:43:11 File "/var/lib/jenkins/.local/lib/python3.6/site-packages/torch/testing/_internal/common_utils.py", line 1153, in assertEqual
03:43:11 exact_dtype=exact_dtype, exact_device=exact_device)
03:43:11 File "/var/lib/jenkins/.local/lib/python3.6/site-packages/torch/testing/_internal/common_utils.py", line 1127, in assertEqual
03:43:11 self.assertTrue(result, msg=msg)
03:43:11 AssertionError: False is not true : Tensors failed to compare as equal! With rtol=0.001 and atol=1e-05, found 10 element(s) (out of 400) whose difference(s) exceeded the margin of error (including 0 nan comparisons). The greatest difference was 0.00048828125 (-0.46484375 vs. -0.46533203125), which occurred at index (11, 18).
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44304
Reviewed By: malfet, izdeby
Differential Revision: D23578316
Pulled By: mruberry
fbshipit-source-id: 558eecf42677383e7deaa4961e12ef990ffbe28c
