Only include ServerHost constant in debug builds

Summary: I recently changed the implementation of `getServerHost` to be more expensive. I am excluding it from constants in non-debug builds, since loading that module lies on a critical path.

Reviewed By: axe-fb

Differential Revision: D12982150

fbshipit-source-id: eaaa50418726dbb2da2d517d0810f39b0dc7fac2

Author: stepanhruda

Diff for: ReactAndroid/src/main/java/com/facebook/react/modules/systeminfo/AndroidInfoModule.java

@@ -14,6 +14,7 @@
 
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.bridge.ReactContextBaseJavaModule;
+import com.facebook.react.common.build.ReactBuildConfig;
 import com.facebook.react.module.annotations.ReactModule;
 
 import java.util.HashMap;
@@ -69,7 +70,9 @@ public String getName() {
     constants.put("Serial", Build.SERIAL);
     constants.put("Fingerprint", Build.FINGERPRINT);
     constants.put("Model", Build.MODEL);
-    constants.put("ServerHost", AndroidInfoHelpers.getServerHost());
+    if (ReactBuildConfig.DEBUG) {
+      constants.put("ServerHost", AndroidInfoHelpers.getServerHost());
+    }
     constants.put("isTesting", "true".equals(System.getProperty(IS_TESTING)));
     constants.put("reactNativeVersion", ReactNativeVersion.VERSION);
     constants.put("uiMode", uiMode());