fixup! chore(google_benchmark): import google benchmark "fork"

Author: GuillaumeLagrange

google_benchmark/src/benchmark.cc

@@ -379,6 +379,8 @@ void Report(BenchmarkReporter* display_reporter,
 void RunBenchmarks(const std::vector<BenchmarkInstance>& benchmarks,
                    BenchmarkReporter* display_reporter,
                    BenchmarkReporter* file_reporter) {
+  auto& Err = display_reporter->GetErrorStream();
+
   // Note the file_reporter can be null.
   BM_CHECK(display_reporter != nullptr);