Upgrade to mapbox/variant 1.1.4

third_party/variant/test/include/auto_cpu_timer.hpp

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <chrono>
+#include <iostream>
+
+struct auto_cpu_timer {
+    std::chrono::time_point<std::chrono::high_resolution_clock> start;
+    auto_cpu_timer() : start(std::chrono::high_resolution_clock::now()) {
+    }
+    ~auto_cpu_timer() {
+        auto end = std::chrono::high_resolution_clock::now();
+        std::chrono::microseconds elapsed =
+            std::chrono::duration_cast<std::chrono::microseconds>(end - start);
+        std::cerr << elapsed.count() << "us" << std::endl;
+    }
+};