Upgrade V8 to version 4.9.385.28
https://chromium.googlesource.com/v8/v8/+/4.9.385.28
FPIIM-449
Change-Id: I4b2e74289d4bf3667f2f3dc8aa2e541f63e26eb4
diff --git a/test/mjsunit/regress/regress-ensure-initial-map.js b/test/mjsunit/regress/regress-ensure-initial-map.js
new file mode 100644
index 0000000..dbd4762
--- /dev/null
+++ b/test/mjsunit/regress/regress-ensure-initial-map.js
@@ -0,0 +1,22 @@
+// 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
+
+var x = Object.getOwnPropertyDescriptor({get x() {}}, "x").get;
+function f(o, b) {
+ if (b) {
+ return o instanceof x;
+ }
+}
+
+%OptimizeFunctionOnNextCall(f);
+f();
+
+function g() {
+ return new x();
+}
+
+%OptimizeFunctionOnNextCall(g);
+assertThrows(()=>g());