Fixed issue#1507 : Memory leak happening while using registerModule/unregisterModule.

Author: parth67

src/store.js

@@ -1,7 +1,7 @@
 import applyMixin from './mixin'
 import devtoolPlugin from './plugins/devtool'
 import ModuleCollection from './module/module-collection'
-import { forEachValue, isObject, isPromise, assert } from './util'
+import { forEachValue, isObject, isPromise, assert, partial } from './util'
 
 let Vue // bind on install
 
@@ -256,7 +256,7 @@ function resetStoreVM (store, state, hot) {
   const computed = {}
   forEachValue(wrappedGetters, (fn, key) => {
     // use computed to leverage its lazy-caching mechanism
-    computed[key] = () => fn(store)
+    computed[key] = partial(fn, store)
     Object.defineProperty(store.getters, key, {
       get: () => store._vm[key],
       enumerable: true // for local getters

src/util.js

@@ -64,3 +64,9 @@ export function isPromise (val) {
 export function assert (condition, msg) {
   if (!condition) throw new Error(`[vuex] ${msg}`)
 }
+
+export function partial (fn, ...bindargs) {
+  return function (...callargs) {
+    return fn(...bindargs, ...callargs)
+  }
+}