[iOS GPU] [BE] use channel-last to transform the weights

[xta0]

Stack from ghstack:

• [iOS GPU] [BE] use channel-last to transform the weights #59113 [iOS GPU] [BE] use channel-last to transform the weights

Manually permuting the weights is slower than calling at::contiguous()

Differential Revision: D28762278

[facebook-github-bot]

💊 CI failures summary and remediations

As of commit ea67f45 (more details on the Dr. CI page):

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• 1/1 failures introduced in this PR

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🕵️ 1 new failure recognized by patterns

The following CI failures do not appear to be due to upstream breakages:

Linux CI (pytorch-linux-xenial-py3.6-gcc5.4) / test (1/1)

Step: "Test PyTorch" (full log | diagnosis details | 🔁 rerun)

2021-06-02T17:47:24.1556270Z Build left local git repository checkout dirty

2021-06-02T17:47:14.9491964Z real	73m41.650s
2021-06-02T17:47:14.9492249Z user	127m38.630s
2021-06-02T17:47:14.9492505Z sys	26m56.658s
2021-06-02T17:47:14.9492799Z + assert_git_not_dirty
2021-06-02T17:47:14.9494062Z + [[ pytorch-linux-xenial-py3.6-gcc5.4 != *rocm* ]]
2021-06-02T17:47:14.9494901Z + [[ pytorch-linux-xenial-py3.6-gcc5.4 != *xla* ]]
2021-06-02T17:47:14.9495538Z ++ git status --porcelain
2021-06-02T17:47:24.1554323Z + git_status=' M third_party/onnx'
2021-06-02T17:47:24.1555238Z + [[ -n  M third_party/onnx ]]
2021-06-02T17:47:24.1555785Z + echo 'Build left local git repository checkout dirty'
2021-06-02T17:47:24.1556270Z Build left local git repository checkout dirty
2021-06-02T17:47:24.1556786Z + echo 'git status --porcelain:'
2021-06-02T17:47:24.1557223Z git status --porcelain:
2021-06-02T17:47:24.1557652Z + echo ' M third_party/onnx'
2021-06-02T17:47:24.1557969Z  M third_party/onnx
2021-06-02T17:47:24.1558251Z + exit 1
2021-06-02T17:47:24.1558501Z + cleanup
2021-06-02T17:47:24.1558776Z + retcode=1
2021-06-02T17:47:24.1559038Z + set +x
2021-06-02T17:47:24.1559360Z =================== sccache compilation log ===================
2021-06-02T17:47:24.1752890Z =========== If your build fails, please take a look at the log above for possible reasons ===========

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[facebook-github-bot]

This pull request has been merged in 1765f51.