[turbofan] Fix deopt point for [[ToName]] lazy bailout.

This fixes the deoptimization information for the lazy bailout point
after a [[ToName]] operation inserted for object literals and class
literals. The result value was erroneously ignored.

R=jarin@chromium.org
TEST=mjsunit/regress/regress-crbug-627828
BUG=chromium:627828

Review-Url: https://codereview.chromium.org/2149493003
Cr-Commit-Position: refs/heads/master@{#37719}

src/compiler/ast-graph-builder.cc

@@ -3734,7 +3734,7 @@ Node* AstGraphBuilder::BuildToBoolean(Node* input, TypeFeedbackId feedback_id) {
 Node* AstGraphBuilder::BuildToName(Node* input, BailoutId bailout_id) {
   if (Node* node = TryFastToName(input)) return node;
   Node* name = NewNode(javascript()->ToName(), input);
-  PrepareFrameState(name, bailout_id);
+  PrepareFrameState(name, bailout_id, OutputFrameStateCombine::Push());
   return name;
 }
 

src/full-codegen/full-codegen.cc

@@ -1066,7 +1066,7 @@ void FullCodeGenerator::EmitPropertyKey(ObjectLiteralProperty* property,
                                         BailoutId bailout_id) {
   VisitForStackValue(property->key());
   CallRuntimeWithOperands(Runtime::kToName);
-  PrepareForBailoutForId(bailout_id, BailoutState::NO_REGISTERS);
+  PrepareForBailoutForId(bailout_id, BailoutState::TOS_REGISTER);
   PushOperand(result_register());
 }
 

test/mjsunit/regress/regress-crbug-627828.js

+// Copyright 2016 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 TestDeoptFromCopmputedNameInObjectLiteral() {
+  function f() {
+    var o = {
+      toString: function() {
+        %DeoptimizeFunction(f);
+        return "x";
+      }
+    };
+    return { [o]() { return 23 } };
+  }
+  assertEquals(23, f().x());
+  assertEquals(23, f().x());
+  %OptimizeFunctionOnNextCall(f);
+  assertEquals(23, f().x());
+})();
+
+(function TestDeoptFromCopmputedNameInClassLiteral() {
+  function g() {
+    var o = {
+      toString: function() {
+        %DeoptimizeFunction(g);
+        return "y";
+      }
+    };
+    class C {
+      [o]() { return 42 };
+    }
+    return new C();
+  }
+  assertEquals(42, g().y());
+  assertEquals(42, g().y());
+  %OptimizeFunctionOnNextCall(g);
+  assertEquals(42, g().y());
+})();