Update to CI text to ensure correct flags are set for XNNPACK testing

Author: BujSet

.ci/scripts/test_model.sh

@@ -49,13 +49,22 @@ prepare_artifacts_upload() {
 }
 
 build_cmake_executor_runner() {
+  local backend_string_select="${1:-}"
   echo "Building executor_runner"
   rm -rf ${CMAKE_OUTPUT_DIR}
-  cmake -DCMAKE_BUILD_TYPE=Debug \
-      -DEXECUTORCH_BUILD_KERNELS_OPTIMIZED=ON \
-      -DPYTHON_EXECUTABLE="$PYTHON_EXECUTABLE" \
-      -B${CMAKE_OUTPUT_DIR} .
-
+  if [[ "$backend_string_select" == "XNNPACK"]]; then
+    echo "Backend $backend_string_select selected"
+    cmake -DCMAKE_BUILD_TYPE=Debug \
+        -DEXECUTORCH_BUILD_KERNELS_OPTIMIZED=ON \
+        -DEXECUTORCH_BUILD_XNNPACK=ON \
+        -DPYTHON_EXECUTABLE="$PYTHON_EXECUTABLE" \
+        -B${CMAKE_OUTPUT_DIR} .
+  else
+    cmake -DCMAKE_BUILD_TYPE=Debug \
+        -DEXECUTORCH_BUILD_KERNELS_OPTIMIZED=ON \
+        -DPYTHON_EXECUTABLE="$PYTHON_EXECUTABLE" \
+        -B${CMAKE_OUTPUT_DIR} .
+  fi
   cmake --build ${CMAKE_OUTPUT_DIR} -j4 --config Debug
 }
 
@@ -135,10 +144,11 @@ test_model_with_xnnpack() {
 
   # Run test model
   if [[ "${BUILD_TOOL}" == "buck2" ]]; then
+    # TODO eventually buck should also use consolidated executor runners
     buck2 run //examples/xnnpack:xnn_executor_runner -- --model_path "${OUTPUT_MODEL_PATH}"
   elif [[ "${BUILD_TOOL}" == "cmake" ]]; then
     if [[ ! -f ${CMAKE_OUTPUT_DIR}/executor_runner ]]; then
-      build_cmake_executor_runner
+      build_cmake_executor_runner("XNNPACK")
     fi
     ./${CMAKE_OUTPUT_DIR}/executor_runner --model_path "${OUTPUT_MODEL_PATH}"
   else