This decomposes `diagonal_copy` into `as_strided_copy` and `diagonal_scatter`
into `as_strided_scatter`.

Currently these are decomposed into mutations, which can't be used by inductor
because the `_scatter` and `_copy` variants are output by functionalization to
remove mutations from the graph. So by re-introducing mutations in their
decomposition, we break the assumptions of the graph.

[ghstack-poisoned]

…ter"

Currently these are decomposed into `as_strided`, which forces a buffer to be
realized. Instead, this lowers them into a native inductor view node and so
doesn't require any buffers to be realized.

[ghstack-poisoned]

…ter"

Currently these are decomposed into `as_strided`, which forces a buffer to be
realized. Instead, this lowers them into a native inductor view node and so
doesn't require any buffers to be realized.

[ghstack-poisoned]

…ter"

Currently these are decomposed into `as_strided`, which forces a buffer to be
realized. Instead, this lowers them into a native inductor view node and so
doesn't require any buffers to be realized.

[ghstack-poisoned]

…ter"

Currently these are decomposed into `as_strided`, which forces a buffer to be
realized. Instead, this lowers them into a native inductor view node and so
doesn't require any buffers to be realized.

[ghstack-poisoned]

…ter"

Currently these are decomposed into `as_strided`, which forces a buffer to be
realized. Instead, this lowers them into a native inductor view node and so
doesn't require any buffers to be realized.

[ghstack-poisoned]

…ter"

Currently these are decomposed into `as_strided`, which forces a buffer to be
realized. Instead, this lowers them into a native inductor view node and so
doesn't require any buffers to be realized.

[ghstack-poisoned]

…ter"

Currently these are decomposed into `as_strided`, which forces a buffer to be
realized. Instead, this lowers them into a native inductor view node and so
doesn't require any buffers to be realized.

[ghstack-poisoned]

…onal_scatter"

Currently these are decomposed into `as_strided`, which forces a buffer to be
realized. Instead, this lowers them into a native inductor view node and so
doesn't require any buffers to be realized.

cc voznesenskym penguinwu EikanWang jgong5 Guobing-Chen XiaobingSuper zhuhaozhe blzheng Xia-Weiwen wenzhe-nrv jiayisunx ipiszy ngimel yf225 chenyang78

[ghstack-poisoned]