Add toolchain to build aarch64 using clang-16

As TensorFlow is moving to build releases with clang
it would be best to build IO with clang also.

third_party/toolchains/clang_manylinux2014_aarch64/BUILD

@@ -0,0 +1,79 @@
+# Copyright 2016 The Bazel 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
+#
+#    http://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.
+
+# This becomes the BUILD file for @local_config_cc// under non-FreeBSD unixes.
+
+package(default_visibility = ["//visibility:public"])
+
+load(":cc_toolchain_config.bzl", "cc_toolchain_config")
+
+licenses(["notice"])  # Apache 2.0
+
+cc_library(
+    name = "malloc",
+)
+
+filegroup(
+    name = "empty",
+    srcs = [],
+)
+
+filegroup(
+    name = "compiler_deps",
+    srcs = glob(["extra_tools/**"]) + [":empty"],
+)
+
+# This is the entry point for --crosstool_top.  Toolchains are found
+# by lopping off the name of --crosstool_top and searching for
+# the "${CPU}" entry in the toolchains attribute.
+cc_toolchain_suite(
+    name = "toolchain",
+    toolchains = {
+        "local|compiler": ":cc-clang-compiler-aarch64",
+        "aarch64": ":cc-clang-compiler-aarch64",
+    },
+)
+
+cc_toolchain(
+    name = "cc-clang-compiler-aarch64",
+    all_files = ":compiler_deps",
+    ar_files = ":empty",
+    as_files = ":empty",
+    compiler_files = ":compiler_deps",
+    dwp_files = ":empty",
+    linker_files = ":compiler_deps",
+    objcopy_files = ":empty",
+    strip_files = ":empty",
+    supports_param_files = 1,
+    toolchain_config = ":linux_clang_aarch64",
+    toolchain_identifier = "linux_clang_aarch64",
+)
+
+cc_toolchain_config(
+    name = "linux_clang_aarch64",
+    compiler = "/usr/lib/llvm-16/bin/clang",
+    cpu = "aarch64",
+)
+
+toolchain(
+    name = "cc-toolchain-clang-aarch64",
+    exec_compatible_with = [
+        # TODO(katre): add autodiscovered constraints for host CPU and OS.
+    ],
+    target_compatible_with = [
+        # TODO(katre): add autodiscovered constraints for host CPU and OS.
+    ],
+    toolchain = ":cc-clang-compiler-aarch64",
+    toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
+)

third_party/toolchains/clang_manylinux2014_aarch64/WORKSPACE

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+# DO NOT EDIT: automatically generated WORKSPACE file for cc_autoconf rule
+workspace(name = "local_config_cc")