Fix Hydrogen's BuildStore()

test/mjsunit/regress/regress-crbug-417508.js

+// Copyright 2014 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(x) {
+  var k = "value";
+  return x[k] = 1;
+}
+var obj = {};
+Object.defineProperty(obj, "value", {set: function(x) { throw "nope"; }});
+try { foo(obj); } catch(e) {}
+try { foo(obj); } catch(e) {}
+%OptimizeFunctionOnNextCall(foo);
+try { foo(obj); } catch(e) {}
+
+function bar(x) {
+  var k = "value";
+  return (x[k] = 1) ? "ok" : "nope";
+}
+var obj2 = {};
+Object.defineProperty(obj2, "value",
+    {set: function(x) { throw "nope"; return true; } });
+
+try { bar(obj2); } catch(e) {}
+try { bar(obj2); } catch(e) {}
+%OptimizeFunctionOnNextCall(bar);
+try { bar(obj2); } catch(e) {}