[ET-VK] Optimizing buffer to int8 quantized packing op to improve width packed performance.

[trivedivivek]

Stack from ghstack (oldest at bottom):

• [ET-VK] Adding push constant and ubo verison of select and slice ops to improve memory and performance. #12358
• [ET-VK] Adding get or create int function to read int value. #12357
• -> [ET-VK] Optimizing buffer to int8 quantized packing op to improve width packed performance. #12388
• [ET-VK] Minor performance improvements for buffer to int8 quantized packing. #12383
• [ET-VK] Using push constants for unary op. #12308

This diff simplifies looping in int8 quantized packing operation for width pack tensor, to improve performance.

Differential Revision: D78143041

[pytorch-bot]

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✅ You can merge normally! (5 Unrelated Failures)

As of commit 2ac3962 with merge base 31ba959 ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-eval_llama-mmlu-linux / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128

BROKEN TRUNK - The following jobs failed but was present on the merge base:

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

• pull / unittest / linux / linux-job (gh) (trunk failure)
  devtools/inspector/tests/inspector_utils_test.py::TestInspectorUtils::test_equip_debug_handle_to_export_program_success
• pull / unittest / macos / macos-job (gh) (trunk failure)
  devtools/inspector/tests/inspector_utils_test.py::TestInspectorUtils::test_equip_debug_handle_to_export_program_success
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  devtools/inspector/tests/inspector_utils_test.py::TestInspectorUtils::test_equip_debug_handle_to_export_program_success
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  devtools/inspector/tests/inspector_utils_test.py::TestInspectorUtils::test_equip_debug_handle_to_export_program_success

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This pull request was exported from Phabricator. Differential Revision: D78143041

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