Fast literals: fixed initialization of non-copied in-object property fields

test/mjsunit/regress/regress-crbug-245424.js

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 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
 
-var y;
-function f() {
-  var a = [];
-  a[20] = 0;
-  y = 3;
-  var i = 7 * (y + -0);
-  a[i] = 1/y;
-  assertFalse(isNaN(a[i]));
+function boom() {
+  var a = {
+    foo: "bar",
+    foo: "baz"
+  };
+  return a;
 }
 
-f();
-f();
-f();
-%OptimizeFunctionOnNextCall(f);
-f();
-
+assertEquals("baz", boom().foo);
+assertEquals("baz", boom().foo);
+%OptimizeFunctionOnNextCall(boom);
+assertEquals("baz", boom().foo);