Remove remaining @flow annotations

packages/babel-core/src/helpers/merge.js

@@ -1,5 +1,3 @@
-/* @flow */
-
 import merge from "lodash/object/merge";
 
 export default function (dest?: Object, src?: Object): ?Object {

packages/babel-core/src/helpers/normalize-ast.js

@@ -1,5 +1,3 @@
-/* @flow */
-
 import * as t from "babel-types";
 
 /**

packages/babel-core/src/transformation/file/options/index.js

@@ -1,5 +1,3 @@
-/* @flow */
-
 import * as parsers from "./parsers";
 import config from "./config";
 

packages/babel-core/src/transformation/file/options/parsers.js

@@ -1,5 +1,3 @@
-/* @flow */
-
 import slash from "slash";
 import * as util from "../../../util";
 

packages/babel-core/src/transformation/internal-plugins/block-hoist.js

@@ -1,5 +1,3 @@
-/* @flow */
-
 import Plugin from "../plugin";
 import sortBy from "lodash/collection/sortBy";
 

packages/babel-core/src/transformation/pipeline.js

@@ -1,7 +1,3 @@
-/* @flow */
-/* global BabelFileResult */
-/* global BabelFileMetadata */
-
 import normalizeAst from "../helpers/normalize-ast";
 import Plugin from "./plugin";
 import File from "./file";

packages/babel-core/src/util.js

@@ -1,5 +1,3 @@
-/* @flow */
-
 import escapeRegExp from "lodash/string/escapeRegExp";
 import startsWith from "lodash/string/startsWith";
 import isBoolean from "lodash/lang/isBoolean";