Fix detection of indexed properties in Object.defineProperty()

Fix detection of indexed properties in Object.defineProperty()

When defining an indexed property on an Array object, the object's
length property should (perhaps) be updated.  This was done for any
property for which

  ToUInt32(name) == ToNumber(name)

was true, meaning any property name that, when converted to a number,
was an integer in the range [0, 2^32).  The detection should be more
strict; an indexed property is one for which

  ToString(ToUInt32(name)) == name

is true only.

Committed: http://code.google.com/p/v8/source/detail?r=14242

[Jens Widell, 2013-04-11 11:29:38]

Fixing a minor issue where Object.defineProperty() incorrectly updates .length
on Array objects.

[Michael Starzinger, 2013-04-12 08:10:09]

LGTM. I'll land this. Thanks for the patch!

[Michael Starzinger, 2013-04-12 08:45:23]

Committed patchset #1 manually as r14242 (presubmit successful).

[Jens Widell, 2013-04-12 08:48:00]

On 2013/04/12 08:45:23, Michael Starzinger wrote:
> Committed patchset #1 manually as r14242 (presubmit successful).

Many thanks!