Move plugin processing to top of plugins (#6381)

* centralize plugin options

* Centralize plugins options

- move more options to the top
- move validations that depend on options to the top

* use isLoose option

* Move more validations to the top

* Move ref parameter for rewriteModuleStatementsAndPrepareHeader() to the top

* fix eslint errors

* remove unused parameter

* set default systemGlobal value

* Revert "Move ref parameter for rewriteModuleStatementsAndPrepareHeader() to the top"

This reverts commit b3855302d17fa19d8acb4c8accab3680c8d2710e.

* Revert "Move more validations to the top"

This reverts commit e5861d8a034ff8f553391f55654f753bcf428a5d.

* fix allowMutablePropsOnTags option usage

* improve naming

* change Contructor definition for sake of consistency

* move allowMutablePropsOnTags validation to the top

* add missing !

packages/babel-plugin-transform-es2015-arrow-functions/src/index.js

@@ -1,11 +1,11 @@
 import type NodePath from "babel-traverse";
 
-export default function() {
+export default function(babel, options) {
+  const { spec } = options;
   return {
     visitor: {
       ArrowFunctionExpression(
         path: NodePath<BabelNodeArrowFunctionExpression>,
-        state: Object,
       ) {
         // In some conversion cases, it may have already been converted to a function while this callback
         // was queued up.
@@ -15,7 +15,7 @@ export default function() {
           // While other utils may be fine inserting other arrows to make more transforms possible,
           // the arrow transform itself absolutely cannot insert new arrow functions.
           allowInsertArrow: false,
-          specCompliant: !!state.opts.spec,
+          specCompliant: !!spec,
         });
       },
     },