Allow reference to watcher to be available during create.

Author: mitar

src/core/instance/lifecycle.js

@@ -193,7 +193,8 @@ export function mountComponent (
     }
   }
 
-  vm._watcher = new Watcher(vm, updateComponent, noop)
+  vm._watcher = new Watcher(vm, updateComponent, noop, { delayed: true })
+  vm._watcher.get()
   hydrating = false
 
   // manually mounted instance, call mounted on self

src/core/observer/watcher.js

@@ -83,7 +83,7 @@ export default class Watcher {
       }
     }
     this.getter = wrapWatcherGetter(this.getter)
-    this.value = this.lazy
+    this.value = this.lazy || (options && options.delayed)
       ? undefined
       : this.get()
   }