external: import cpu_features library

Taken from https://github.com/google/cpu_features at revision
26133d3b620c2c27f31d571efd27371100f891e9

external/cpu_features/test/hwcaps_for_testing.cc

@@ -0,0 +1,45 @@
+// Copyright 2017 Google Inc.
+//
+// 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.
+
+#include <string.h>
+
+#include "hwcaps_for_testing.h"
+#include "internal/string_view.h"
+
+namespace cpu_features {
+
+namespace {
+static auto* const g_hardware_capabilities = new HardwareCapabilities();
+static auto* const g_platform_types = new PlatformType();
+}  // namespace
+
+void SetHardwareCapabilities(uint32_t hwcaps, uint32_t hwcaps2) {
+  g_hardware_capabilities->hwcaps = hwcaps;
+  g_hardware_capabilities->hwcaps2 = hwcaps2;
+}
+
+HardwareCapabilities CpuFeatures_GetHardwareCapabilities(void) {
+  return *g_hardware_capabilities;
+}
+
+void SetPlatformTypes(const char* platform, const char* base_platform) {
+  CpuFeatures_StringView_CopyString(str(platform), g_platform_types->platform,
+                                    sizeof(g_platform_types->platform));
+  CpuFeatures_StringView_CopyString(str(base_platform),
+                                    g_platform_types->base_platform,
+                                    sizeof(g_platform_types->base_platform));
+}
+
+PlatformType CpuFeatures_GetPlatformType(void) { return *g_platform_types; }
+}  // namespace cpu_features