[ic] Restore PROPERTY key tracking in keyed ICs

test/mjsunit/regress/regress-crbug-594183.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
+
+var global = {}
+
+var fish = [
+  {'name': 'foo'},
+  {'name': 'bar'},
+];
+
+for (var i = 0; i < fish.length; i++) {
+  global[fish[i].name] = 1;
+}
+
+function load() {
+  var sum = 0;
+  for (var i = 0; i < fish.length; i++) {
+    var name = fish[i].name;
+    sum += global[name];
+  }
+  return sum;
+}
+
+load();
+load();
+%OptimizeFunctionOnNextCall(load);
+load();
+assertOptimized(load);
+
+function store() {
+  for (var i = 0; i < fish.length; i++) {
+    var name = fish[i].name;
+    global[name] = 1;
+  }
+}
+
+store();
+store();
+%OptimizeFunctionOnNextCall(store);
+store();
+assertOptimized(store);
+
+// Regression test for KeyedStoreIC bug: would use PROPERTY mode erroneously.
+
+function store_element(obj, key) {
+  obj[key] = 0;
+}
+
+var o1 = new Array(3);
+var o2 = new Array(3);
+o2.o2 = "o2";
+var o3 = new Array(3);
+o3.o3 = "o3";
+var o4 = new Array(3);
+o4.o4 = "o4";
+var o5 = new Array(3);
+o5.o5 = "o5";
+// Make the KeyedStoreIC megamorphic.
+store_element(o1, 0);  // Premonomorphic
+store_element(o1, 0);  // Monomorphic
+store_element(o2, 0);  // 2-way polymorphic.
+store_element(o3, 0);  // 3-way polymorphic.
+store_element(o4, 0);  // 4-way polymorphic.
+store_element(o5, 0);  // Megamorphic.
+
+function inferrable_store(key) {
+  store_element(o5, key);
+}
+
+inferrable_store(0);
+inferrable_store(0);
+%OptimizeFunctionOnNextCall(inferrable_store);
+inferrable_store(0);
+assertOptimized(inferrable_store);
+// If |inferrable_store| emitted a generic keyed store, it won't deopt upon
+// seeing a property name key. It should have inferred a receiver map and
+// emitted an elements store, however.
+inferrable_store("deopt");
+assertUnoptimized(inferrable_store);