let inductor generate broadcast when loading a single value

[ngimel]

For better perf with MLIR triton.
Changes

tmp32 = tl.load(seed3 + (0 + tl.zeros([XBLOCK, RBLOCK], tl.int32)), None)

to

tmp32_load = tl.load(seed3+(0)); tmp32 = tl.broadcast_to(tmp32_load, [XBLOCK, RBLOCK])

cc @mlazos @soumith @voznesenskym @yanboliang @penguinwu @anijain2305 @EikanWang @jgong5 @Guobing-Chen @chunyuan-w @XiaobingSuper @zhuhaozhe @blzheng @Xia-Weiwen @wenzhe-nrv @jiayisunx @peterbell10 @desertfire @Jokeren

[pytorch-bot]

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❌ 3 Failures, 1 Pending

As of commit eed2a9c:

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• win-vs2019-cpu-py3 / test (default, 1, 2, windows.4xlarge)
• win-vs2019-cpu-py3 / test (default, 2, 2, windows.4xlarge)
• win-vs2019-cpu-py3 / test (functorch, 1, 1, windows.4xlarge)

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[ngimel]

@pytorchbot rebase

[pytorchmergebot]

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[pytorchmergebot]

Successfully rebased ngimel/inductor_load_0 onto refs/remotes/origin/viable/strict, please pull locally before adding more changes (for example, via git checkout ngimel/inductor_load_0 && git pull --rebase)

[ngimel]

@pytorchbot merge -f "test failures unrelated"

[pytorchmergebot]

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