Revert of Clean up promises and fix an edge case bug

test/mjsunit/regress/regress-3641.js

Index: test/mjsunit/regress/regress-3641.js
diff --git a/test/mjsunit/regress/regress-3641.js b/test/mjsunit/regress/regress-3641.js
deleted file mode 100644
index 9aff8c8f7de599961399559bfd5dcc676aa561ce..0000000000000000000000000000000000000000
--- a/test/mjsunit/regress/regress-3641.js
+++ /dev/null
@@ -1,56 +0,0 @@
-// Copyright 2015 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Flags: --allow-natives-syntax
-
-// If a Promise's then method is overridden, that should be respected
-// even if the promise is already resolved. x's resolution function is
-// only called by Promise.resolve(); there shouldn't be a resolution
-// check before when calling x.then.
-
-
-// Async assert framework copied from mjsunit/es6/promises.js
-
-var asyncAssertsExpected = 0;
-
-function assertAsyncRan() { ++asyncAssertsExpected }
-
-function assertLater(f, name) {
-  assertFalse(f()); // should not be true synchronously
-  ++asyncAssertsExpected;
-  var iterations = 0;
-  function runAssertion() {
-    if (f()) {
-      print(name, "succeeded");
-      --asyncAssertsExpected;
-    } else if (iterations++ < 10) {
-      %EnqueueMicrotask(runAssertion);
-    } else {
-      %AbortJS(name + " FAILED!");
-    }
-  }
-  %EnqueueMicrotask(runAssertion);
-}
-
-function assertAsyncDone(iteration) {
-  var iteration = iteration || 0;
-  %EnqueueMicrotask(function() {
-    if (asyncAssertsExpected === 0)
-      assertAsync(true, "all")
-    else if (iteration > 10)  // Shouldn't take more.
-      assertAsync(false, "all... " + asyncAssertsExpected)
-    else
-      assertAsyncDone(iteration + 1)
-  });
-}
-
-// End async assert framework
-
-var y;
-var x = Promise.resolve();
-x.then = () => { y = true; }
-Promise.resolve().then(() => x);
-assertLater(() => y === true, "y === true");
-
-assertAsyncDone();