Suppress "ioctl points to uninitialised" check (pytorch#48187)

Summary:
libcuda.so from CUDA-11.1 makes ioctl() that valgrind's memcheck tool considers dangerous
Instruct valgrind to suppress that check

Fixes false positives reported in https://app.circleci.com/pipelines/github/pytorch/pytorch/240774/workflows/d4c66de8-f13b-47a2-ae62-2ec1bbe0664b/jobs/9026496

Pull Request resolved: pytorch#48187

Reviewed By: janeyx99

Differential Revision: D25059850

Pulled By: malfet

fbshipit-source-id: 982df5860524482b0fcb2bfc6bb490fb06694cf6

Author: malfet

aten/tools/valgrind.sup

@@ -24,6 +24,15 @@
    ...
 }
 
+{
+   ignore_cuda_ioctl_param_points_to_uninitialised_bytes
+   Memcheck:Param
+   ioctl(generic)
+   fun:ioctl
+   obj:*libcuda.so*
+   ...
+}
+
 {
    ignore_libomp_setaffinity_check
    Memcheck:Param