chore: remove this.cacheable calls as it is true by default

Author: yyx990803

lib/loader.js

@@ -8,8 +8,6 @@ const hotReloadAPIPath = normalize.dep('vue-hot-reload-api')
 const componentNormalizerPath = normalize.lib('runtime/component-normalizer')
 
 module.exports = function (content) {
-  this.cacheable()
-
   let output = ''
 
   const loaderContext = this

lib/style-compiler/index.js

@@ -6,7 +6,6 @@ const trim = require('./plugins/trim')
 const scopeId = require('./plugins/scope-id')
 
 module.exports = function (css, map) {
-  this.cacheable()
   const cb = this.async()
   const loaderOptions = loaderUtils.getOptions(this) || {}
   const inlineConfig = (this._compilation.__vueOptions__ || {}).postcss

lib/template-compiler/index.js

@@ -8,7 +8,6 @@ const transformRequire = require('./modules/transform-require')
 const transformSrcset = require('./modules/transform-srcset')
 
 module.exports = function (html) {
-  this.cacheable()
   const isServer = this.target === 'node'
   const isProduction = this.minimize || process.env.NODE_ENV === 'production'
   const vueOptions = this._compilation.__vueOptions__ || {}

lib/template-compiler/preprocessor.js

@@ -4,7 +4,6 @@ const cons = require('consolidate')
 const loaderUtils = require('loader-utils')
 
 module.exports = function (content) {
-  this.cacheable && this.cacheable()
   const callback = this.async()
   const opt = loaderUtils.getOptions(this) || {}