Skip QNNpack tests on ppc64le (where support is not enabled) (#23343)
Summary:
Proposed PR for
https://github.com/pytorch/pytorch/issues/23342
Disables execution of QNNpack tests if IS_PPC.
Basically this parallels the same skipping of tests for IS_WINDOWS as well, which is already present.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23343
Differential Revision: D16469218
Pulled By: soumith
fbshipit-source-id: 80b651d00e5d413e359cf418f79e20d74cd9c8e1
