Track peak RAM in benchmarks

src/benchmarks/bench.cpp

@@ -656,12 +656,10 @@ try
         return EXIT_FAILURE;
     }
 
-    std::cout 
+    std::cout << "Peak RAM: " << std::setprecision(3)
-        << "Peak RAM: " 
+              << static_cast<double>(osrm::util::PeakRAMUsedInBytes()) /
-        << std::setprecision(3) 
+                     static_cast<double>((1024 * 1024))
-        << static_cast<double>(osrm::util::PeakRAMUsedInBytes()) / static_cast<double>((1024 * 1024)) 
+              << "MB" << std::endl;
-        << "MB"
-        << std::endl;
 
     return EXIT_SUCCESS;
 }