[WIP][Inductor] Fix combo kernels for cpu backend

[karthickai]

Stack from ghstack (oldest at bottom):

• -> [WIP][Inductor] Fix combo kernels for cpu backend #167781

Fixes: #167780

cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @ipiszy @chenyang78 @kadeng @muchulee8 @amjames @chauhang @aakhundov @coconutruben @mlazos

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/167781

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✅ You can merge normally! (4 Unrelated Failures)

As of commit 7f62da0 with merge base 8919f69 ():

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• inductor / inductor-cpu-test / test (cpu_inductor_torchbench, 2, 2, linux.2xlarge.amx) (gh) (similar failure)
  stable_diffusion_unet
• inductor / inductor-cpu-test / test (dynamic_cpu_inductor_torchbench, 2, 2, linux.2xlarge.amx) (gh) (similar failure)
  stable_diffusion_unet
• inductor / inductor-test / test (inductor_torchbench, 2, 2, linux.g5.4xlarge.nvidia.gpu) (gh) (similar failure)
  stable_diffusion_unet

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• trunk / linux-jammy-py3-clang12-executorch / test (executorch, 1, 1, lf.linux.2xlarge, unstable) (gh) (#166072)
  backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe

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