chore: import upstream snapshot with attribution

tensorflow/lite/tools/cmake/modules/xnnpack/CMakeLists.txt

@@ -0,0 +1,33 @@
+#
+# Copyright 2022 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# The "-mcpu=" switch might be introduced externaly into CMake: either in <LANG>_FLAGS or
+# as part of CC, CXX, ASM environmental variables (to be stored in CMAKE_<LANG>_COMPILER_ARG1).
+# This switch is not compatible with XNNPACK build mechanism and causes the XNNPACK compilation
+# break due to "unsupported instructions". This switch needs to be removed for XNNPACK
+# In order to isolate the changes only for XNNPACK and its depencencies, a subfolder is
+# introduced.
+
+foreach(FLAG IN ITEMS CMAKE_ASM_FLAGS CMAKE_ASM_COMPILER_ARG1 CMAKE_C_FLAGS CMAKE_C_COMPILER_ARG1 CMAKE_CXX_FLAGS CMAKE_CXX_COMPILER_ARG1)
+  if(${FLAG})
+    string(REGEX REPLACE "-mcpu=[-a-zA-Z0-9_.^$*+?]*" "" _tmp ${${FLAG}})
+    set(${FLAG} ${_tmp})
+  endif()
+endforeach()
+
+add_subdirectory(
+  "${xnnpack_SOURCE_DIR}"
+  "${xnnpack_BINARY_DIR}"
+)