main: Log host system memory parameters

Logs both physical memory and swapfile sizes, this is useful for support.

src/citra_qt/main.cpp

@@ -213,6 +213,10 @@ GMainWindow::GMainWindow()
     LOG_INFO(Frontend, "Host CPU: {}", cpu_string);
 #endif
     LOG_INFO(Frontend, "Host OS: {}", QSysInfo::prettyProductName().toStdString());
+    LOG_INFO(Frontend, "Host RAM: {:.2f} GB",
+             Common::GetMemInfo().TotalPhysicalMemory / 1024.0f / 1024 / 1024);
+    LOG_INFO(Frontend, "Host Swap: {:.2f} GB",
+             Common::GetMemInfo().TotalSwapMemory / 1024.0f / 1024 / 1024);
     UpdateWindowTitle();
 
     show();