Removing one shift op from quantized linear shader to improve perf.

[trivedivivek]

Summary: This diff removes a redundant mask op from 4 bit quantized linear shader to improve performance.

Reviewed By: SS-JIA

Differential Revision: D84679388

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15191

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 3 New Failures, 6 Pending, 4 Unrelated Failures

As of commit 98f71ba with merge base acd0636 ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 91b927063e3e962d814725c12b69406ab319aa91167e06c576fdf28e2fdfaef2 /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t cbc50444f665e7c140ba7916b194af17ad158d6249d6cff93a72c8ddd225789d /exec failed with exit code 1
• Test CUDA Builds / export-voxtral-cuda-artifact / linux-job (gh)
  RuntimeError: Command docker exec -t b67ee4ed59daa0ffd0cdfb94d5680ffebacefe64ca08aac98f8d9aed9b420374 /exec failed with exit code 2

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

• pull / unittest / linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / unittest-editable / linux / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / android / run-emulator (gh) (trunk failure)
  The process '/usr/bin/sh' failed with exit code 255

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[meta-codesync]

@trivedivivek has exported this pull request. If you are a Meta employee, you can view the originating Diff in D84679388.