Add missing es7.promise.finally polyfill when using useBuiltIns: usage (#8500)

Usage of a `finally` instance method should trigger import of the `es7.promise.finally` polyfill, but it doesn't. This PR adds the missing definition and a test.

packages/babel-preset-env/src/built-in-definitions.js

@@ -46,6 +46,7 @@ export const definitions = {
     every: ["es6.array.is-array"],
     fill: ["es6.array.fill"],
     filter: ["es6.array.filter"],
+    finally: ["es7.promise.finally"],
     find: ["es6.array.find"],
     findIndex: ["es6.array.find-index"],
     fixed: ["es6.string.fixed"],

packages/babel-preset-env/test/fixtures/preset-options-add-used-built-ins/promise-finally/input.mjs

@@ -0,0 +1,4 @@
+var p = Promise.resolve(0);
+p.finally(() => {
+  alert("OK");
+});

packages/babel-preset-env/test/fixtures/preset-options-add-used-built-ins/promise-finally/options.json

@@ -0,0 +1,14 @@
+{
+  "presets": [
+    [
+      "../../../../lib",
+      {
+        "targets": {
+          "browsers": ["ie > 10"]
+        },
+        "useBuiltIns": "usage",
+        "modules": false
+      }
+    ]
+  ]
+}

packages/babel-preset-env/test/fixtures/preset-options-add-used-built-ins/promise-finally/output.mjs

@@ -0,0 +1,6 @@
+import "core-js/modules/es7.promise.finally";
+import "core-js/modules/es6.promise";
+var p = Promise.resolve(0);
+p.finally(function () {
+  alert("OK");
+});