feat: enable bugfixes option for babel by default

Per the discussion at babel/babel#11083,
it should not be considered a breaking change

Closes vuejs#5301
Closes vuejs#4848

Author: haoqunjiang

packages/@vue/babel-preset-app/index.js

@@ -59,6 +59,7 @@ module.exports = (context, options = {}) => {
     debug = false,
     useBuiltIns = 'usage',
     modules = false,
+    bugfixes = true,
     targets: rawTargets,
     spec,
     ignoreBrowserslistConfig = !!process.env.VUE_CLI_MODERN_BUILD,
@@ -137,6 +138,7 @@ module.exports = (context, options = {}) => {
   }
 
   const envOptions = {
+    bugfixes,
     corejs: useBuiltIns ? 3 : false,
     spec,
     loose,

packages/@vue/babel-preset-app/package.json

@@ -30,7 +30,7 @@
     "@babel/plugin-syntax-dynamic-import": "^7.8.3",
     "@babel/plugin-syntax-jsx": "^7.8.3",
     "@babel/plugin-transform-runtime": "^7.8.3",
-    "@babel/preset-env": "^7.8.4",
+    "@babel/preset-env": "^7.9.0",
     "@babel/runtime": "^7.8.4",
     "@vue/babel-preset-jsx": "^1.1.2",
     "babel-plugin-dynamic-import-node": "^2.3.0",