[turbofan] Fix lowering of Array constructor with one argument.

Only create a singleton array for Array(len) if Type(len) cannot be
Number, otherwise we might need to throw an exception instead.

BUG=chromium:715404
R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2838123004
Cr-Commit-Position: refs/heads/master@{#44886}

src/compiler/js-create-lowering.cc

@@ -815,7 +815,7 @@ Reduction JSCreateLowering::ReduceJSCreateArray(Node* node) {
     } else if (p.arity() == 1) {
       Node* length = NodeProperties::GetValueInput(node, 2);
       Type* length_type = NodeProperties::GetType(length);
-      if (!length_type->Maybe(Type::Unsigned32())) {
+      if (!length_type->Maybe(Type::Number())) {
         // Handle the single argument case, where we know that the value
         // cannot be a valid Array length.
         return ReduceNewArray(node, {length}, site);

test/mjsunit/regress/regress-crbug-715404.js

+// 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
+
+function foo() { Array(-1); }
+assertThrows(foo, RangeError);
+assertThrows(foo, RangeError);
+%OptimizeFunctionOnNextCall(foo);
+assertThrows(foo, RangeError);