Index: src/wp-includes/functions.php
===================================================================
--- src/wp-includes/functions.php	(revision 34880)
+++ src/wp-includes/functions.php	(working copy)
@@ -1260,37 +1260,6 @@
 }

 /**
- * Check or set whether WordPress is in "installation" mode.
- *
- * If the `WP_INSTALLING` constant is defined during the bootstrap, `wp_installing()` will default to `true`.
- *
- * @since 4.4.0
- *
- * @staticvar bool $installing
- *
- * @param bool $is_installing Optional. True to set WP into Installing mode, false to turn Installing mode off.
- *                            Omit this parameter if you only want to fetch the current status.
- * @return bool True if WP is installing, otherwise false. When a `$is_installing` is passed, the function will
- *              report whether WP was in installing mode prior to the change to `$is_installing`.
- */
-function wp_installing( $is_installing = null ) {
-	static $installing = null;
-
-	// Support for the `WP_INSTALLING` constant, defined before WP is loaded.
-	if ( is_null( $installing ) ) {
-		$installing = defined( 'WP_INSTALLING' ) && WP_INSTALLING;
-	}
-
-	if ( ! is_null( $is_installing ) ) {
-		$old_installing = $installing;
-		$installing = $is_installing;
-		return (bool) $old_installing;
-	}
-
-	return (bool) $installing;
-}
-
-/**
  * Test whether blog is already installed.
  *
  * The cache will be checked first. If you have a cache plugin, which saves
Index: src/wp-includes/load.php
===================================================================
--- src/wp-includes/load.php	(revision 34880)
+++ src/wp-includes/load.php	(working copy)
@@ -841,3 +841,34 @@

 	$wp_locale = new WP_Locale();
 }
+
+/**
+ * Check or set whether WordPress is in "installation" mode.
+ *
+ * If the `WP_INSTALLING` constant is defined during the bootstrap, `wp_installing()` will default to `true`.
+ *
+ * @since 4.4.0
+ *
+ * @staticvar bool $installing
+ *
+ * @param bool $is_installing Optional. True to set WP into Installing mode, false to turn Installing mode off.
+ *                            Omit this parameter if you only want to fetch the current status.
+ * @return bool True if WP is installing, otherwise false. When a `$is_installing` is passed, the function will
+ *              report whether WP was in installing mode prior to the change to `$is_installing`.
+ */
+function wp_installing( $is_installing = null ) {
+	static $installing = null;
+
+	// Support for the `WP_INSTALLING` constant, defined before WP is loaded.
+	if ( is_null( $installing ) ) {
+		$installing = defined( 'WP_INSTALLING' ) && WP_INSTALLING;
+	}
+
+	if ( ! is_null( $is_installing ) ) {
+		$old_installing = $installing;
+		$installing = $is_installing;
+		return (bool) $old_installing;
+	}
+
+	return (bool) $installing;
+}