Bump to v4.12.0.

_mapCacheClear.js

@@ -0,0 +1,19 @@
+define(['./_Hash', './_ListCache', './_Map'], function(Hash, ListCache, Map) {
+
+  /**
+   * Removes all key-value entries from the map.
+   *
+   * @private
+   * @name clear
+   * @memberOf MapCache
+   */
+  function mapCacheClear() {
+    this.__data__ = {
+      'hash': new Hash,
+      'map': new (Map || ListCache),
+      'string': new Hash
+    };
+  }
+
+  return mapCacheClear;
+});