Update base for Update on "Add U55 and U85 16A8W linear tests"

Add U55 and U85 16A8W quantization tests for linear operations following the pattern established in D80510628 for mul operations.

This adds test coverage for 16A8W (16-bit activations, 8-bit weights) quantization on both Ethos-U55 and Ethos-U85 platforms for linear operations. Both tests are marked with xfail annotations due to the known Vela compilation issue where int16 linear operations fail with "Conv2D Invalid arguments" error.

The tests follow the same structure as the existing 16A8W TOSA test but target specific hardware platforms:
- test_linear_16a8w_u55_INT16: Tests on U55 with rank1 data
- test_linear_16a8w_u85_INT16: Tests on U85 with both rank1 and rank4 data

Both tests use the same symmetric A16W8 quantization configuration and are properly decorated with platform-specific skip conditions (XfailIfNoCorstone300/320) and pytest xfail markers referencing GitHub issue 13947.

Addresses: #13729

Differential Revision: [D82618039](https://our.internmc.facebook.com/intern/diff/D82618039/)

[ghstack-poisoned]

Author: Ninja91

.ci/docker/ci_commit_pins/optimum-executorch.txt

@@ -1 +1 @@
-40b02a2dc61bbf901a2df91719f47c98d65368ec
+828ae02053a6e0e20a2dfd6e737ba10c6f4dee6b

.ci/scripts/test_backend_linux.sh

@@ -39,12 +39,17 @@ if [[ "$FLOW" == *qnn* ]]; then
 fi
 
 if [[ "$FLOW" == *vulkan* ]]; then
-    # Setup swiftshader and Vulkan SDK which are required to build the Vulkan delegate
+    # Setup swiftshader and Vulkan SDK which are required to build the Vulkan delegate.
     source .ci/scripts/setup-vulkan-linux-deps.sh
 
     EXTRA_BUILD_ARGS+=" -DEXECUTORCH_BUILD_VULKAN=ON"
 fi
 
+if [[ "$FLOW" == *arm* ]]; then
+    # Setup ARM deps.
+    .ci/scripts/setup-arm-baremetal-tools.sh
+fi
+
 # We need the runner to test the built library.
 PYTHON_EXECUTABLE=python CMAKE_ARGS="$EXTRA_BUILD_ARGS" .ci/scripts/setup-linux.sh --build-tool cmake --build-mode Release --editable true
 

.ci/scripts/test_llava.sh

@@ -149,7 +149,7 @@ run_and_verify() {
 
     # verify result.txt
     RESULT=$(cat result.txt)
-    EXPECTED_PREFIX="ASSISTANT: image captures a basketball game in progress, with"
+    EXPECTED_PREFIX="ASSISTANT: The image captures a basketball game in progress, with"
 
     if [[ "${RESULT}" == *"${EXPECTED_PREFIX}"* ]]; then
         echo "Expected result prefix: ${EXPECTED_PREFIX}"

.github/workflows/_link_check.yml

@@ -55,3 +55,29 @@ jobs:
           echo "Or add \`@lint-ignore\` somewhere on the same line as the reference you want to skip checking."
           exit 1
         }
+
+  lint-file-size:
+    if: ${{ github.event_name == 'pull_request' }}
+    uses: pytorch/test-infra/.github/workflows/linux_job_v2.yml@main
+    with:
+      runner: linux.2xlarge
+      docker-image: ci-image:executorch-ubuntu-22.04-linter
+      submodules: false
+      fetch-depth: 0
+      ref: ${{ inputs.ref }}
+      timeout: 30
+      script: |
+        chmod +x ./scripts/lint_file_size.sh
+        ./scripts/lint_file_size.sh $(
+          if [ "${{ github.event_name }}" = "pull_request" ]; then
+            echo "${{ github.event.pull_request.base.sha }}" "${{ github.event.pull_request.head.sha }}"
+          else
+            echo "${{ github.event.before }}" "${{ github.sha }}"
+          fi
+        ) || {
+          echo
+          echo "File size lint failed: some files exceed the 1 MB limit."
+          echo "If you really need large files, consider using Git LFS or storing them elsewhere."
+          echo "If you really need to get unblocked and check in the file, can add it to the EXCEPTIONS list in scripts/lint_file_size.sh."
+          exit 1
+        }

.github/workflows/_test_backend.yml

@@ -31,6 +31,11 @@ on:
         required: false
         type: boolean
         default: false
+      runner-linux:
+        description: 'Runner type for Linux jobs'
+        required: false
+        type: string
+        default: linux.4xlarge.memory
 
 jobs:
   test-backend-linux:
@@ -44,7 +49,7 @@ jobs:
     uses: pytorch/test-infra/.github/workflows/linux_job_v2.yml@main
     with:
       ref: ${{ inputs.ref }}
-      runner: linux.4xlarge.memory
+      runner: ${{ inputs.runner-linux }}
       docker-image: ci-image:executorch-ubuntu-22.04-clang12
       submodules: recursive
       timeout: ${{ inputs.timeout }}

.github/workflows/test-backend-arm.yml

@@ -0,0 +1,29 @@
+name: Test ARM Backend
+
+on:
+  schedule:
+    - cron: 0 2 * * *
+  push:
+    branches:
+      - release/*
+    tags:
+      - ciflow/nightly/*
+  pull_request:
+    paths:
+      - .github/workflows/test-backend-arm.yml
+      - .github/workflows/_test_backend.yml
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}--${{ github.event.pull_request.number || github.sha }}-${{ github.event_name == 'workflow_dispatch' }}
+  cancel-in-progress: true
+
+jobs:
+  test-arm:
+    uses: ./.github/workflows/_test_backend.yml
+    with:
+      backend: arm
+      flows: '["arm_tosa"]'
+      ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
+      timeout: 120
+      run-linux: true

.github/workflows/test-backend-coreml.yml

@@ -4,6 +4,8 @@ on:
   schedule:
     - cron: 0 2 * * *
   push:
+    branches:
+      - release/*
     tags:
       - ciflow/nightly/*
   pull_request:

.github/workflows/test-backend-qnn.yml

@@ -4,6 +4,8 @@ on:
   schedule:
     - cron: 0 2 * * *
   push:
+    branches:
+      - release/*
     tags:
       - ciflow/nightly/*
   pull_request:
@@ -25,3 +27,4 @@ jobs:
       ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
       timeout: 120
       run-linux: true
+      runner-linux: linux.8xlarge.memory

.github/workflows/test-backend-vulkan.yml

@@ -4,6 +4,8 @@ on:
   schedule:
     - cron: 0 2 * * *
   push:
+    branches:
+      - release/*
     tags:
       - ciflow/nightly/*
   pull_request:

.github/workflows/test-backend-xnnpack.yml

@@ -4,6 +4,8 @@ on:
   schedule:
     - cron: 0 2 * * *
   push:
+    branches:
+      - release/*
     tags:
       - ciflow/nightly/*
   pull_request: