[turbofan] Mark {JSCreate} as potentially throwing.

test/mjsunit/regress/regress-5638.js

Index: test/mjsunit/regress/regress-5638.js
diff --git a/test/mjsunit/regress/regress-5638.js b/test/mjsunit/regress/regress-5638.js
new file mode 100644
index 0000000000000000000000000000000000000000..034e4c40beb5c0727ac48d9f3ddfeeebfa671e12
--- /dev/null
+++ b/test/mjsunit/regress/regress-5638.js
@@ -0,0 +1,32 @@
+// Copyright 2017 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
+
+class MyErrorA {}
+
+class MyErrorB {}
+
+class A {}
+
+class B extends A {
+  constructor() {
+    try {
+      super();
+    } catch (e) {
+      throw new MyErrorB();
+    }
+  }
+}
+
+var thrower = new Proxy(A, {
+  get(target, property, receiver) {
+    if (property === 'prototype') throw new MyErrorA();
+  }
+});
+
+assertThrows(() => Reflect.construct(B, [], thrower), MyErrorB);
+assertThrows(() => Reflect.construct(B, [], thrower), MyErrorB);
+%OptimizeFunctionOnNextCall(B);
+assertThrows(() => Reflect.construct(B, [], thrower), MyErrorB);