Update to core-js@3 (#7646)

### `@babel/runtime`
- Added `@babel/runtime-corejs3` package and `corejs: 3` options to `@babel/plugin-transform-runtime`.
- Added support of instance methods, fixes #8928.
- Added flag `proposals` (in `corejs: { version: 3, proposals: true }` format) for support all proposals polyfills from `core-js`.
- Used separate directories in runtime for `core-js` entry points with proposals and without.
- Used `get-iterator-method` helper for getting iterators, fixes #2500.
- As a cheap bonus, added support of IE8- (except some cases of `regenerator`).

### `@babel/polyfill`
- Should be deprecated in favor of separate usage required features from `core-js` and `regenerator-runtime` with an informative message.

### `@babel/preset-env`
- Uses for built-ins data from [`core-js-compat`](https://github.com/zloirock/core-js/tree/master/packages/core-js-compat) instead of `compat-table` since information from `compat-table` [is not enough](https://github.com/zloirock/core-js/tree/master/packages/core-js-compat).
- `useBuilIns` now requires direct setting of `corejs` version option, without it will be used `2` by default and shown deprecation warning.
- Added support of minor `core-js` versions for simplify updating in the future.
- For preventing some order-related problems, polyfills in the both `core-js@3` plugins added on `post` stage in the order of `core-js-compat` data.
- Divided plugins and polyfills parts of `preset-env`, instead of 2 internal plugins for adding polyfills, we have 6: usage and entry versions of plugins for `core-js@2`, ### Current state:
`core-js@3`, `regenerator-runtime`.
- Added support `samsung` target (for Samsung Internet) since `core-js-compat` and `compat-table` now contains mapping for this, fixes #6602.

#### `useBuilIns: entry` with `corejs: 3`
- No longer transforms `@babel/polyfill`.
- Transforms **all possible** `core-js` entry points to import of related modules (based on data from [`core-js-compat`](https://unpkg.com/core-js-compat@3.0.0-beta.15/entries.json)).
- Since of this, we no longer need `shippedProposals` / `proposals` flags with `useBuilIns: entry`.
- Removes `regenerator-runtime/runtime` import where it's not required.

#### `useBuilIns: usage` with `corejs: 3`
- In addition to `shippedProposals`, added flag `proposals`  (in `corejs: { version: 3, proposals: true }` format) for polyfill all proposals from `core-js`.
- Fixed list of dependencies in built-in definitions.
- Improved the way of determination method / built-in name and source of this method.
- Adds import of required polyfills on `MemberExpression`, `ObjectPattern`, `in` operator.
- Adds import of required polyfills on access to global object properties.
- Adds import of all required common iterators on all syntax features which use iterators protocol (`for-of`, destructuring, spread, `yield` delegation, etc.).
- Adds import of promises on syntax features which use promises (async functions/generators, dynamic import, etc.), fixes #9250, #7402, etc.

### `core-js@2` stuff
I didn't want to tough `core-js@2`-related stuff, however
- Fixed some serious errors in definitions which breaks `Object.getOwnPropertySymbols`, `Symbol.toStringTag` logic, `Promise#finally`, `Array#forEach`, etc.
- `Array#flatMap` and trim methods moved to stable features as a part of ES2019 and loaded by deprecated `@babel/polyfill` and `@babel/preset-env` with `corejs: 2` option.

packages/babel-plugin-transform-runtime/scripts/build-dist.js

@@ -8,43 +8,81 @@ const template = require("@babel/template");
 const t = require("@babel/types");
 
 const transformRuntime = require("../");
-const getCorejs2Definitions = require("../lib/definitions").default;
-const corejs2Definitions = getCorejs2Definitions();
+const transformMemberExpressionLiterals = require("@babel/plugin-transform-member-expression-literals");
+const transformPropertyLiterals = require("@babel/plugin-transform-property-literals");
+
+const corejs2Definitions = require("../lib/runtime-corejs2-definitions").default();
+const corejs3Definitions = require("../lib/runtime-corejs3-definitions").default();
 
 writeHelpers("@babel/runtime");
-
-writeCoreJS2("@babel/runtime-corejs2");
 writeHelpers("@babel/runtime-corejs2", { corejs: 2 });
+writeHelpers("@babel/runtime-corejs3", {
+  corejs: { version: 3, proposals: true },
+});
 
-function writeCoreJS2(runtimeName) {
-  const pkgDirname = getRuntimeRoot(runtimeName);
-
-  const paths = [
+writeCoreJS({
+  corejs: 2,
+  proposals: true,
+  definitions: corejs2Definitions,
+  paths: [
     "is-iterable",
     "get-iterator",
-
     // This was previously in definitions, but was removed to work around
     // zloirock/core-js#262. We need to keep it in @babel/runtime-corejs2 to
     // avoid a breaking change there.
     "symbol/async-iterator",
-  ];
+  ],
+  corejsRoot: "core-js/library/fn",
+});
+writeCoreJS({
+  corejs: 3,
+  proposals: false,
+  definitions: corejs3Definitions,
+  paths: [],
+  corejsRoot: "core-js-pure/stable",
+});
+writeCoreJS({
+  corejs: 3,
+  proposals: true,
+  definitions: corejs3Definitions,
+  paths: ["is-iterable", "get-iterator", "get-iterator-method"],
+  corejsRoot: "core-js-pure/features",
+});
 
-  Object.keys(corejs2Definitions.builtins).forEach(key => {
-    const path = corejs2Definitions.builtins[key];
-    paths.push(path);
+function writeCoreJS({
+  corejs,
+  proposals,
+  definitions: { BuiltIns, StaticProperties, InstanceProperties },
+  paths,
+  corejsRoot,
+}) {
+  const pkgDirname = getRuntimeRoot(`@babel/runtime-corejs${corejs}`);
+
+  Object.keys(BuiltIns).forEach(name => {
+    const { stable, path } = BuiltIns[name];
+    if (stable || proposals) paths.push(path);
   });
 
-  Object.keys(corejs2Definitions.methods).forEach(key => {
-    const props = corejs2Definitions.methods[key];
-    Object.keys(props).forEach(key2 => {
-      paths.push(props[key2]);
+  Object.keys(StaticProperties).forEach(builtin => {
+    const props = StaticProperties[builtin];
+    Object.keys(props).forEach(name => {
+      const { stable, path } = props[name];
+      if (stable || proposals) paths.push(path);
     });
   });
 
-  paths.forEach(function(corePath) {
+  if (InstanceProperties) {
+    Object.keys(InstanceProperties).forEach(name => {
+      const { stable, path } = InstanceProperties[name];
+      if (stable || proposals) paths.push(`instance/${path}`);
+    });
+  }
+
+  const runtimeRoot = proposals ? "core-js" : "core-js-stable";
+  paths.forEach(function(corejsPath) {
     outputFile(
-      path.join(pkgDirname, "core-js", `${corePath}.js`),
-      `module.exports = require("core-js/library/fn/${corePath}");`
+      path.join(pkgDirname, runtimeRoot, `${corejsPath}.js`),
+      `module.exports = require("${corejsRoot}/${corejsPath}");`
     );
   });
 }
@@ -118,6 +156,8 @@ function buildHelper(
     presets: [[require("@babel/preset-env"), { modules: false }]],
     plugins: [
       [transformRuntime, { corejs, useESModules: esm }],
+      [transformMemberExpressionLiterals],
+      [transformPropertyLiterals],
       buildRuntimeRewritePlugin(
         runtimeName,
         path.relative(path.dirname(helperFilename), pkgDirname),