[turbofan] Fix an assertion in representation selection for BooleanNot.

BUG=chromium:736567

Review-Url: https://codereview.chromium.org/2962503002
Cr-Commit-Position: refs/heads/master@{#46216}

src/compiler/simplified-lowering.cc

@@ -1569,8 +1569,7 @@ class RepresentationSelector {
             node->AppendInput(jsgraph_->zone(), jsgraph_->FalseConstant());
             NodeProperties::ChangeOp(node, lowering->machine()->WordEqual());
           } else {
-            DCHECK_EQ(MachineRepresentation::kNone,
-                      input_info->representation());
+            DCHECK(!TypeOf(node->InputAt(0))->IsInhabited());
             DeferReplacement(node, lowering->jsgraph()->Int32Constant(0));
           }
         } else {

test/mjsunit/compiler/regress-736567.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 f(b, x) {
+  var o = b ? { a : 1 } : undefined;
+  return o.a + !(x & 1);
+}
+
+f(1);
+
+function g() {
+  f(0, "s");
+}
+
+assertThrows(g);
+%OptimizeFunctionOnNextCall(g);
+assertThrows(g);